Sebastian is an assistant professor at Wesleyan University's Mathematics and Computer Science Department. His research interests are information privacy and security. He is developing privacy tech for the web and mobile app platforms. To help people exercise their privacy rights Sebastian makes use of machine learning and program analysis techniques. Sebastian co-founded Global Privacy Control and is leading the privacy-tech-lab at Wesleyan. He is advising tech companies and governmental regulators.

Before coming to Wesleyan Sebastian was a postdoc at Carnegie Mellon's Institute for Software Research. He studied computer science at Columbia University (PhD, MS) and was a Google Research Fellow at the Berkeley Center for Law & Technology. He was an attorney with Freshfields Bruckhaus Deringer (California and German bar admissions currently inactive). He studied law at the University of Kiel (PhD, JD) and the University of California, Berkeley (LLM).