Johannes Wachs

Postdoctoral Researcher
Chair for Computational Social Sciences and Humanities
RWTH Aachen

About Me

I am a postdoctoral researcher at the Chair for Computational Social Sciences and Humanities at RWTH Aachen studying social phenomena using computational methods. My current research interests include social computing and open source software ecosystems. In my dissertation, supervised by János Kertész at Central European University, I applied network science to study the emergence of corruption and collusion. During my PhD I was a visitor at the Oxford Internet Institute, the Hertie School of Governance, and the Hungarian Academy of Sciences.


October 2019 - I will speak at the seminar of the Institute for Analytical Sociology at Linköping University.
September 2019 - I will be talking at the European Conference on Social Networks in Zurich.
July 2019 - Our paper on cartel detection is now published in Scientific Reports!


A network approach to cartel detection in public auction markets

Johannes Wachs and János Kertész
Scientific Reports, 2019

No country for asylum seekers? How short-term exposure to refugees influences attitudes and voting behavior in Hungary

Theresa Gessler, Gergő Tóth, Johannes Wachs
SocArxiv Preprint, DOI: 10.31235/

Gender Differences in Participation and Reward on Stack Overflow

Anna May, Johannes Wachs, Aniko Hannak
Empirical Software Engineering, 2019

Social capital predicts corruption risk in towns

Johannes Wachs, Taha Yasseri, Balázs Lengyel, János Kertész
Royal Society Open Science, 2019.

The Role of Novelty in Securing Investors for Equity Crowdfunding Campaigns

Emőke-Ágnes Horvát, Johannes Wachs, Rong Wang, Aniko Hannak
AAAI Conference on Human Computation and Crowdsourcing (HCOMP'18), Zurich, Switzerland, 2018

And Now for Something Completely Different: Visual Novelty in an Online Network of Designers

Johannes Wachs, Balint Daroczy, Aniko Hannak, Katinka Pall, Christoph Riedl
Proceedings of the 10th ACM Conference on Web Science (WebSci'18), Amsterdam, May, 2018.

Corruption, government turnover, and public contracting market structure – Insights using network analysis and objective corruption proxies

Mihály Fazekas, Jiří Skuhrovec, Johannes Wachs
Government Transparency Institute Working Paper GTI-WP/2017:02, September 2017.

Why Do Men Get More Attention? Exploring Factors Behind Success in an Online Design Community

Johannes Wachs, Aniko Hannak, Andras Voros, Balint Daroczy
Proceedings of the 11th International AAAI Conference on Weblogs and Social Media (ICWSM'17), Montreal, May, 2017.


Social Networks, course instructor, RWTH Aachen Summer Semester 2019
Using Big Data for social science research, teaching assistant, CEU Spring 2017
Data Mining, course instructor, AIT Fall 2016
Scientific Python, teaching assistant, CEU Fall 2016, 2017


PhD Network Science, summa cum laude, Central European University (2019)
MS Applied Mathematics with distinction, Central European University (2012)
BS Mathematics, BS Economics, cum laude, Tulane University (2009)


johanneswachs at gmail dot com