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Dr. Lennart Kraft

My interests comprise the economic, technical, and legal perspective on data on the internet. I research the relevance of data in online advertising markets for consumers (e.g., online privacy), firms (e.g., targeted advertisements and content personalization) and regulators (e.g., market efficiency). Methodologically, I build upon econometrics and machine learning in cross-sectional and longitudinal settings, often using extensive field data.

Current Affiliations

  • Goethe University Frankfurt
  • Working Group on Research Data Ethics at Committee for Data Access (FDI Committee)

Previous Affiliations

  • Leibniz Institute for Financial Research SAFE
  • Institute of Labor Economics IZA



  • Digital Economy
  • Online Advertising
  • Tracking, Profiling, and Targeting
  • Regulation
  • Market Competition


  • Applied Econometrics
  • Predictive Machine Learning
  • Analytical Modelling
  • Textual Analysis
  • Process Automation


  • Data Analytics, Management, and Ethics
  • Computing via Python, R, and Stata
  • Statistics and Econometric Theory
  • Causality Identification
  • Economic Perspective on Data



  • Skiera, Bernd / Miller, Klaus M. / Jin, Yuxi / Kraft, Lennart / Laub, René / Schmitt, Julia, “The Impact of the General Data Protection Regulation on the Online Advertising Market“, available under or read online under



Selected Working Papers

  • Kraft, Lennart / Miller, Klaus M. / Skiera, Bernd, “Richness and Consistency of Consumer Profiles and Their Development over Time“, (Working Paper).
  • Kraft, Lennart / Skiera, Bernd / Koschella, Tim, “Economic Impact of Apple’s App Tracking Transparency (ATT)“, (Working Paper).
  • Kraft, Lennart / Lukic, Karlo / Skiera, Bernd / Koschella, Tim, „Impact of Data Collection Practices on Mobile Advertising Revenue“, (Working Paper)
  • Kraft, Lennart, “Tax Revenue, Privacy, and Profits under Taxed Targeted Advertisements“, (Working Paper).
  • Kraft, Lennart, “Leveraging Differential Privacy for Targeted Advertisements“, (Working Paper).
  • Kraft, Lennart / Skiera, Bernd, “Use of Legal Basis under GDPR“, (Working Paper).



Lennart Kraft


Raum 1.202 im RuW-Gebäude
Theodor-W.-Adorno-Platz 4
D-60323 Frankfurt am Main