Seit 2014: Professor für Allgemeine Kommunikationswissenschaft am Institut für Publizistik

2023: Vising Professor, Department of Communication and Media, University of Michigan

2009-2013: Post-Doc am Institut für Publizistikwissenschaft und Medienforschung (IPMZ), Universität Zürich im Bereich Medienpsychologie und –effekte

2013: Vertretungsprofessur für Kommunikationswissenschaft für das Sommersemester an der Ludwig-Maximilians-Universität in München

2010-2011: Visiting Scholar an der Annenberg School for Communication, University of Pennsylvania in Philadelphia

2003-2009: Wissenschaftlicher Mitarbeiter am Institut für Publizistikwissenschaft und Medienforschung (IPMZ), Universität Zürich im Bereich Medienpsychologie und –effekte

2003: Projektmanager bei PRIME research International AG und Co. KG in Mainz

1997-2003: Studium der Publizistik, Politikwissenschaft und Romanische Philologie, Johannes Gutenberg-Universität Mainz

  • Kommunikation über und Vorurteile zu sozialen Gruppen
  • Inhalte und Wirkung politischer Kommunikation
  • Werbewirkung und Konsumentenverhalten
  • Methoden der Kommunikationswissenschaft
  • 2021: Best Method Paper and First Place Open Competition Paper, Communication Theory & Methodology Division, Association for Education in Journalism and Mass Communication (AEJMC)
  • 2021: Best Paper Award, Political Communication Division, International Communication Association (ICA)
  • 2018: Kaid-Sanders Best Political Communication Article of the Year award by the Political Communication Division, International Communication Association (ICA)

2026

Corbu, N., Halagiera, D., Jin, S., Stanyer, J., Stromback, J., Matthes, J., Hopmann, D. N., Schemer, C., Koc-Michalska, K., & Aalberg, T. (2026). Illusory Superiority About Misinformation Detection and Its Relationship to Knowledge and Fact-Checking Intentions: Evidence from 18 Countries. MASS COMMUNICATION AND SOCIETY, 29(1), 101-120. DOI

2025

Fawzi, N., Ziegele, M., Schultz, T., Jackob, N., Jakobs, I., Viehmann, C., Quiring, O., Schemer, C., & Stegmann, D. (2025). Stabiles Medienvertrauen auch in Zeiten politischer Umbrüche. Mainzer Langzeitstudie Medienvertrauen 2024. Media Perspektiven, 2025(13), 1-20.
Meltzer, C. E., Jost, P., Schemer, C., Kruschinski, S., & Maurer, M. (2025). How (Gendered) Media Portrayals of Refugees Affect Attitudes Toward Immigration. The Moderating Role of Political Ideology. POLITICAL COMMUNICATION, 42(5), 882-900. DOI

2024

Bartsch, A., Neuberger, C., Stark, B., Karnowski, V., Maurer, M., Pentzold, C., Quandt, T., Quiring, O., & Schemer, C. (2024). Epistemic authority in the digital public sphere. An integrative conceptual framework and research agenda. COMMUNICATION THEORY, 35(1), 37-50. DOI
Quiring, O., Ziegele, M., Schultz, T., Fawzi, N., Jackob, N., Jakobs, I., Schemer, C., Stegmann, D., & Viehmann, C. (2024). Zurück zum Niveau vor der Pandemie – Konsolidierung von Vertrauen und Misstrauen. Mainzer Langzeitstudie Medienvertrauen 2023. Media Perspektiven, 9, 1-14.
Schemer, C., Stanyer, J., Meltzer, C. E., Gehle, L., Van Aelst, P., Theocharis, Y., Stroembaeck, J., Stetka, V., Stepinska, A., Splendore, S., Zoizner, A., Matthes, J., Koc-Michalska, K., Hopmann, D. N., Esser, F., de Vreese, C., David, Y., Corbu, N., Castro, L., Cardenal, A. S., Aalberg, T., van Erkel, P., Terren, L., & Halagiera, D. (2024). The Relationship Between Political Entertainment Media Use and Political Efficacy: A Comparative Study in 18 Countries. INTERNATIONAL JOURNAL OF PUBLIC OPINION RESEARCH, 36(4). DOI
Zilinsky, J., Theocharis, Y., Pradel, F., Tulin, M., de Vreese, C., Aalberg, T., Cardenal, A. S., Corbu, N., Esser, F., Gehle, L., Halagiera, D., Hameleers, M., Hopmann, D. N., Koc-Michalska, K., Matthes, J., Schemer, C., Stetka, V., Stromback, J., Terren, L., Splendore, S., Stanyer, J., Stepinska, A., Van Aelst, P., & Zoizner, A. (2024). Justifying an Invasion: When Is Disinformation Successful?. POLITICAL COMMUNICATION, 41(6), 965-986. DOI

2023

Jackob, N., Schultz, T., Jakobs, I., Quiring, O., Schemer, C., Ziegele, M., & Viehmann, C. (2023). Medienvertrauen in Deutschland. Bundeszentrale für Politische Bildung.
Jakobs, I., Jackob, N., Schultz, T., Ziegele, M., Quiring, O., Fawzi, N., Schemer, C., Stegmann, D., & Viehmann, C. (2023). Medienvertrauen in Krisenzeiten. Der öffentlich-rechtliche Rundfunk im Kontext aktueller gesellschaftlicher Entwicklungen. Aus Politik Und Zeitgeschichte, 73(25), 34-41.
Matthes, J., Corbu, N., Jin, S., Theocharis, Y., Schemer, C., van Aelst, P., Stromback, J., Koc-Michalska, K., Esser, F., Aalberg, T., Cardenal, A. S., Castro, L., de Vreese, C., Hopmann, D., Sheafer, T., Splendore, S., Stanyer, J., Stepinska, A., Stetka, V., & Zoizner, A. (2023). Perceived prevalence of misinformation fuels worries about COVID-19: a cross-country, multi-method investigation. INFORMATION COMMUNICATION & SOCIETY, 26(16), 3135-3158. DOI
Schultz, T., Ziegele, M., Jackob, N., Viehmann, C., Jakobs, I., Fawzi, N., Quiring, O., Schemer, C., & Stegmann, D. (2023). Medienvertrauen nach Pandemie und „Zeitenwende“. Mainzer Langzeitstudie Medienvertrauen 2022. Media Perspektiven, 8, 1-17.
Theocharis, Y., Cardenal, A., Jin, S., Aalberg, T., Hopmann, D. N., Strömbäck, J., Castro, L., Esser, F., Van Aelst, P., de Vreese, C., Corbu, N., Koc-Michalska, K., Matthes, J., Schemer, C., Sheafer, T., Splendore, S., Stanyer, J., Stępińska, A., & Štětka, V. (2023). Does the platform matter? Social media and COVID-19 conspiracy theory beliefs in 17 countries. New Media &Amp; Society, 25(12), 3412-3437. DOI

2022

Castro, L., Strömbäck, J., Esser, F., Van Aelst, P., de Vreese, C., Aalberg, T., Cardenal, A. S., Corbu, N., Hopmann, D. N., Koc-Michalska, K., Matthes, J., Schemer, C., Sheafer, T., Splendore, S., Stanyer, J., Stępińska, A., Štětka, V., & Theocharis, Y. (2022). Navigating High-Choice European Political Information Environments: a Comparative Analysis of News User Profiles and Political Knowledge. The International Journal of Press/Politics, 27(4), 827-859. DOI
Denner, N., Schäfer, S., & Schemer, C. (2022). Passionate Hiking Fan or Loving Parent? How Personalized Self- Presentation in the Media Affects the Perception of Female and Male Politicians. International Journal of Communication, 16, 1778-1803.
Mueller, K. W., Beutel, M. E., Reinecke, L., Dreier, M., Schemer, C., Weber, M., Schnauber-Stockmann, A., Stark, B., Quiring, O., & Woelfling, K. (2022). Internet-Related Disorders and Their Effects on Personality Development in Adolescents from Germany-Results from a Prospective Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH, 19(1). DOI
Schemer, C., Ziegele, M., Schultz, T., Quiring, O., Jackob, N., & Jakobs, I. (2022). Political Information Use and Its Relationship to Beliefs in Conspiracy Theories Among the German Public. JOURNALISM & MASS COMMUNICATION QUARTERLY, 99(4), 908-929. DOI
Ziegele, M., Resing, M., Frehmann, K., Jackob, N., Jakobs, I., Quiring, O., Schemer, C., Schultz, T., & Viehmann, C. (2022). Deprived, Radical, Alternatively Informed. European Journal of Health Communication, 3(2), 97-130. DOI
Zoizner, A., Sheafer, T., Castro, L., Aalberg, T., Cardenal, A. S., Corbu, N., de Vreese, C., Esser, F., Hopmann, D. N., Koc-Michalska, K., Matthes, J., Schemer, C., Splendore, S., Stanyer, J., Stepinska, A., Stetka, V., Stromback, J., Theocharis, Y., & Van Aelst, P. (2022). The Effects of the COVID-19 Outbreak on Selective Exposure: Evidence from 17 Countries. POLITICAL COMMUNICATION, 39(5), 674-696. DOI

2021

Group, T. F. (2021). Media and Public Attitudes Toward Migration in Europe A Comparative Approach. Routledge.
Jakobs, I., Jackob, N., Schultz, T., Ziegele, M., Schemer, C., & Quiring, O. (2021). Welche Personenmerkmale sagen Medienvertrauen voraus?. Publizistik, 66(3-4), 463-487. DOI
Jakobs, I., Schultz, T., Viehmann, C., Quiring, O., Jackob, N., Ziegele, M., & Schemer, C. (2021). Medienvertrauen in Krisenzeiten. Mainzer Langzeitstudie Medienvertrauen. Media Perspektiven, 3, 152-162.
Meltzer, C. E., Eberl, J.-M., Theorin, N., Heidenreich, T., Stromback, J., Boomgaarden, H. G., & Schemer, C. (2021). Media effects on policy preferences toward free movement: evidence from five EU member states. JOURNAL OF ETHNIC AND MIGRATION STUDIES, 47(15), 3390-3408. DOI
Quiring, O., Ziegele, M., Schemer, C., Jackob, N., Jakobs, I., & Schultz, T. (2021). Constructive Skepticism, Dysfunctional Cynicism? Skepticism and Cynicism Differently Determine Generalized Media Trust. International Journal of Communication, 15, 3497-3518.
Schemer, C., Masur, P. K., Geiss, S., Mueller, P., & Schaefer, S. (2021). The Impact of Internet and Social Media Use on Well-Being: A Longitudinal Analysis of Adolescents Across Nine Years. JOURNAL OF COMPUTER-MEDIATED COMMUNICATION, 26(1), 1-21. DOI
Schnauber-Stockmann, A., Weber, M., Reinecke, L., Schemer, C., Mueller, K., Beutel, M., & Stark, B. (2021). Mobile (Self-)Socialization: The Role of Mobile Media and Communication in Autonomy and Relationship Development in Adolescence. MASS COMMUNICATION AND SOCIETY, 24(6), 867-891. DOI
Schultz, T., Ziegele, M., Jackob, N., Jakobs, I., Quiring, O., & Schemer, C. (2021). Verschwörungsglaube, Medienzynismus und Militanz: Einstellungen und Informationsquellen von Menschen mit AfD-Wahlpräferenz – ein Beitrag zur Radikalisierungsforschung. ZRex – Zeitschrift für Rechtsextremismusforschung, 1(1-2021), 60-89. DOI
Theorin, N., Meltzer, C. E., Galyga, S., Stromback, J., Schemer, C., Eberl, J.-M., Lind, F., Heidenreich, T., & Boomgaarden, H. G. (2021). Does News Frame Affect Free Movement Attitudes? A Comparative Analysis. JOURNALISM & MASS COMMUNICATION QUARTERLY, 98(3), 725-748. DOI
Van Aelst, P., Toth, F., Castro, L., Stetka, V., de Vreese, C., Aalberg, T., Cardenal, A. S., Corbu, N., Esser, F., Hopmann, D. N., Koc-Michalska, K., Matthes, J., Schemer, C., Sheafer, T., Splendore, S., Stanyer, J., Stepinska, A., Strombock, J., & Theocharis, Y. (2021). Does a Crisis Change News Habits? A Comparative Study of the Effects of COVID-19 on News Media Use in 17 European Countries. DIGITAL JOURNALISM, 9(9), 1316-1346. DOI

2020

Bos, L., Schemer, C., Corbu, N., Hameleers, M., Andreadis, I., Schulz, A., Schmuck, D., Reinemann, C., & Fawzi, N. (2020). The effects of populism as a social identity frame on persuasion and mobilisation: Evidence from a 15‐country experiment. European Journal of Political Research, 59(1), 3-24. DOI
Nagel, M.-T., Schaefer, S., Zlatkin-Troitschanskaia, O., Schemer, C., Maurer, M., Molerov, D., Schmidt, S., & Brueckner, S. (2020). How Do University Students’ Web Search Behavior, Website Characteristics, and the Interaction of Both Influence Students’ Critical Online Reasoning?. FRONTIERS IN EDUCATION, 5. DOI
Reiners, L., & Schemer, C. (2020). A Feature-Based Approach to Assess Hate Speech in User Comments. Questions De Communication, 38, 529-548. DOI
Schemer, C., & Meltzer, C. E. (2020). The Impact of Negative Parasocial and Vicarious Contact with Refugees in the Media on Attitudes toward Refugees. Mass Communication and Society, 23(2), 230-248. DOI
Tonassi, T., Wittlif, A., & Schemer, C. (2020). Mediennutzung und Medienvertrauen von Migrant*innen. Media Perspektiven, 12, 626-635.
Weber, M., Viehmann, C., Ziegele, M., & Schemer, C. (2020). Online Hate Does Not Stay Online – How Implicit and Explicit Attitudes Mediate the Effect of Civil Negativity and Hate in User Comments on Prosocial Behavior. Computers in Human Behavior, 104, 106192-106192. DOI
Wettstein, M., Schulz, A., Steenbergen, M., Schemer, C., Müller, P., Wirz, D. S., & Wirth, W. (2020). Measuring Populism across Nations: Testing for Measurement Invariance of an Inventory of Populist Attitudes. International Journal of Public Opinion Research, 32(2), 284-305. DOI

2019

Müller, P., Geiß, S., Schemer, C., Naab, T. K., & Peter, C. (2019). Dynamische Prozesse der öffentlichen Kommunikation Methodische Herausforderungen. Herbert von Halem Verlag.
Schramm, H., Matthes, J., & Schemer, C. (2019). Emotions Meet Cognitions Zum Zusammenspiel von emotionalen und kognitiven Prozessen in der Medienrezeptions- und Medienwirkungsforschung. Springer-Verlag.
Wettstein, M., Esser, F., Büchel, F., Schemer, C., Wirz, D. S., Schulz, A., Ernst, N., Engesser, S., Müller, P., & Wirth, W. (2019). What Drives Populist Styles? Analyzing Immigration and Labor Market News in 11 Countries. Journalism &Amp; Mass Communication Quarterly, 96(2), 516-536. DOI
Wirz, D. S., Wettstein, M., Schulz, A., Ernst, N., Schemer, C., & Wirth, W. (2019). How populist crisis rhetoric affects voters in Switzerland. Studies in Communication Sciences, 19(1), 69-83. DOI

2018

Eberl, J.-M., Meltzer, C. E., Heidenreich, T., Herrero, B., Theorin, N., Lind, F., Berganza, R., Boomgaarden, H. G., Schemer, C., & Strömbäck, J. (2018). The European media discourse on immigration and its effects: a literature review. Annals of the International Communication Association, 42(3), 207-223. DOI
Hameleers, M., Bos, L., Fawzi, N., Reinemann, C., Andreadis, I., Corbu, N., Schemer, C., Schulz, A., Shaefer, T., Aalberg, T., Axelsson, S., Berganza, R., Cremonesi, C., Dahlberg, S., de Vreese, C. H., Hess, A., Kartsounidou, E., Kasprowicz, D., Matthes, J., Negrea-Busuioc, E., Ringdal, S., Salgado, S., Sanders, K., Schmuck, D., Stromback, J., Suiter, J., Boomgaarden, H., Tenenboim-Weinblatt, K., & Weiss-Yaniv, N. (2018). Start Spreading the News: A Comparative Experiment on the Effects of Populist Communication on Political Engagement in Sixteen European Countries. The International Journal of Press/Politics, 23(4), 517-538. DOI
Mueller, K. W., Woelfling, K., Beutel, M. E., Stark, B., Quiring, O., Aufenanger, S., Schemer, C., Weber, M., & Reinecke, L. (2018). Insights Into Aspects Behind Internet-Related Disorders in Adolescents: The Interplay of Personality and Symptoms of Adjustment Disorders. JOURNAL OF ADOLESCENT HEALTH, 62(2), 234-240. DOI
Reinecke, L., Meier, A., Beutel, M. E., Schemer, C., Stark, B., Woelfling, K., & Mueller, K. W. (2018). The Relationship Between Trait Procrastination, Internet Use, and Psychological Functioning: Results From a Community Sample of German Adolescents. FRONTIERS IN PSYCHOLOGY, 9. DOI
Schulz, A., Müller, P., Schemer, C., Wirz, D. S., Wettstein, M., & Wirth, W. (2018). Measuring Populist Attitudes on Three Dimensions. International Journal of Public Opinion Research, 30(2), 316-326. DOI
Wirz, D. S., Wettstein, M., Schulz, A., Müller, P., Schemer, C., Ernst, N., Esser, F., & Wirth, W. (2018). The Effects of Right-Wing Populist Communication on Emotions and Cognitions toward Immigrants. The International Journal of Press/Politics, 23(4), 496-516. DOI

2017

Baumert, A., Halmburger, A., Rothmund, T., & Schemer, C. (2017). Everyday dynamics in generalized social and political trust. Journal of Research in Personality, 69, 44-54. DOI
Müller, P., Schemer, C., Wettstein, M., Schulz, A., Wirz, D. S., Engesser, S., & Wirth, W. (2017). The polarizing impact of news coverage on populist attitudes in the public : evidence from a panel study in four European democracies. Journal of communication, 67(6), Seiten: 968-992. Author/Publisher URL

2015

Christmann, A., Kübler, D., Hasler, K., Marcinkowski, F., & Schemer, C. (2015). New regionalism : not too complex for the media watchdog ; media reporting and citizens’ perception of democratic legitimacy in four European metropolitan areas. Urban affairs review, 51(5), Seiten: 676-707. Author/Publisher URL
Kühne, R., & Schemer, C. (2015). The emotional effects of news frames on information processing and opinion formation. Communication research, 42(3), Seiten: 387-407. Author/Publisher URL

2014

Schemer, C. (2014). Media effects on racial attitudes : evidence from a three-wave panel survey in a political campaign. International journal of public opinion research, 26(4), Seiten: 531-542. Author/Publisher URL

2012

Matthes, J., & Schemer, C. (2012). Diachronic framing effects in competitive opinion environments. Political communication, 29(3), Seiten: 319-339. Author/Publisher URL
Matthes, J., Morrison, K. R., & Schemer, C. (2012). A spiral of silence for some : attitude certainty and the expression of political minority opinions. Communication research, 37(6), Seiten: 774-800. Author/Publisher URL
Matthes, J., Wirth, W., Schemer, C., & Pachoud, N. (2012). Tiptoe or tackle? : The role of product placement prominence and program involvement for the mere exposure effect. Journal of current issues and research in advertising, 33(2), Seiten: 129-145.
Schemer, C. (2012). Reinforcing spirals of negative affects and selective attention to advertising in a political campaign. Communication research, 39(3), Seiten: 413-434. Author/Publisher URL
Schemer, C. (2012). The influence of news media on stereotypic attitudes toward immigrants in a political campaign. Journal of communication, 62(5), Seiten: 739-757. Author/Publisher URL
Schemer, C., Wirth, W., & Matthes, J. (2012). Value resonance and value framing effects on voting intentions in direct-democratic campaigns. American behavioral scientist, 56(3), Seiten: 334-352. Author/Publisher URL

2011

Kühne, R., Schemer, C., Matthes, J., & Wirth, W. (2011). Affective priming in political campaigns : how campaign-induced emotions prime political opinions. International journal of public opinion research, 23(4), Seiten: 485-507. Author/Publisher URL
Matthes, J., Wirth, W., Schemer, C., & Kissling, A.-K. (2011). I see what you don´t see : the role of individual differences in field dependence-independence as a predictor of product placement recall and brand liking. Journal of advertising, 40(4), Seiten: 85-99. Author/Publisher URL

2010

Schemer, C. (2010). Der affektive Einfluss von politischer Werbung in Kampagnen auf Einstellungen. Medien & Kommunikationswissenschaft, 58(2), Seiten: 227-246. Author/Publisher URL
Schemer, C. (Ed.). (2010). Politische Kommunikation : Wahrnehmung, Verarbeitung, Wirkung (p. 283 S.). Nomos.
Wirth, W., Matthes, J., & Schemer, C. (2010). Agenda building and setting in a referendum campaign : investigating the flow of arguments among campaigners, the media, and the public. Journalism & mass communication quarterly, 87(2), Seiten: 328-345. Author/Publisher URL
Wirth, W., Schemer, C., & Matthes, J. (2010). Trivializing the news? : Affective context effects of commercials on the perception of television news. Mass communication, 13(2), Seiten: 139-156. Author/Publisher URL

2009

Schemer, C., Matthes, J., & Wirth, W. (2009). Applying latent growth models to the analysis of media effects. Journal of media psychology, 21(2), Seiten: 85-89. Author/Publisher URL
Wirth, W., Matthes, J., Schemer, C., & Stämpfli, I. (2009). Glaubwürdigkeitsverlust durch programmintegrierte Werbung? : Eine Untersuchung zu den Kontexteffekten von Produktplatzierungen im Fernsehen. Publizistik, 54(1), Seiten: 64-81. Author/Publisher URL

2008

Matthes, J., Schemer, C., & Wirth, W. (2008). More than meets the eye : investigating the hidden impact of brand placements in television magazines. International journal of advertising, 26(4), Seiten: 477-503.
Schemer, C., Matthes, J., & Wirth, W. (2008). Toward improving the validity and reliability of media information processing measures in surveys. Communication methods and measures, 2(3), Seiten: 193-225. Author/Publisher URL
Schemer, C., Matthes, J., Wirth, W., & Textor, S. (2008). Does “Passing the Courvoisier” always pay off? : Positive and negative evaluative conditioning effects of brand placements in music videos. Psychology & marketing, 25(10), Seiten: 923-943. Author/Publisher URL

2007

Matthes, J., Wirth, W., & Schemer, C. (2007). Measuring the unmeasurable? : Toward operationalizing on-line and memory-based political judgments in surveys. International journal of public opinion research, 19(2), Seiten: 247-257. Author/Publisher URL
Schemer, C. (2007). Wem Medienschönheiten schaden : die differenzielle Anfälligkeit für negative Wirkungen attraktiver Werbemodels auf das Körperbild junger Frauen. Zeitschrift für Medienpsychologie, 19(2), Seiten: 58-67. Author/Publisher URL
Schemer, C., Matthes, J., & Wirth, W. (2007). Werbewirkung ohne Erinnerungseffekte? : Eine experimentelle Studie zum Mere Exposure-Effekt bei Product Placements. Zeitschrift für Medienpsychologie, 19(1), Seiten: 2-13. Author/Publisher URL
Siegert, G., Wirth, W., Mathes, J., Pühringer, K., Rademacher, P., Schemer, C., … Rimscha, B. von (Eds.). (2007). Die Zukunft der Fernsehwerbung : Produktion, Verbreitung und Rezeption von programmintegrierten Werbeformen in der Schweiz (p. 242 S.). Haupt.

2005

Matthes, J., Schemer, C., Willemsen, H., & Wirth, W. (2005). Zur Wirkung von Product Placements : theoretische Überlegungen und experimentelle Befunde zum Mere Exposure-Effekt in audiovisuellen Medien. Medien-Journal, 29(4), Seiten: 23-37.

2003

Schemer, C. (2003). Schlank und krank durch Medienschönheiten? : Zur Wirkung attraktiver weiblicher Medienakteure auf das Körperbild von Frauen. Medien & Kommunikationswissenschaft, 51(3/4), Seiten: 523-540. Author/Publisher URL

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  1. BA Befragung: Mediennutzung & -effekte KF
    Dozent:in: Selina Alexandra Beckmann; Alicia Andrea Ernst; Rebekka Kreling; Jun.-Prof. Dr. Elena Link; Dr. Robin Riemann; Prof. Dr. Christian Schemer
  2. BA Experiment: Medienrezeption & -wirkung KF
    Dozent:in: Dr. Johannes Beckert; Felix Valentin Dietrich; Juliane Keilmann; Prof. Dr. Marcus Maurer; Prof. Dr. Michael Scharkow; Prof. Dr. Christian Schemer

SoSe 2026