Johannes Wachs

Postdoctoral Researcher
Chair for Computational Social Sciences and Humanities
RWTH Aachen

About Me

I am a computational social scientist specializing in network methods. From March 2019 I will be working as a postdoctoral researcher at the Chair for Computational Social Sciences and Humanities at RWTH Aachen. My dissertation, supervised by János Kertész at Central European University's Department of Network and Data Science, studies on corruption and collusion in public procurement markets using a complex networks approach. I am also interested in the use data from the web to better understand the emergence of concepts like novelty, bias, and inequality. In the past I have been a visiting researcher at the Oxford Internet Institute and the Hertie School of Governance in Berlin.
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March 2019 - Starting a new job as a postdoc in Markus Strohmaier's group at RWTH Aachen.
February 2019 - paper on gender differences on Stack Overflow accepted at Empirical Software Engineering!


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

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.


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


MS Applied Mathematics, Central European University (2012)
BS Mathematics, BS Economics, Tulane University (2009)


johanneswachs at gmail dot com