His wikipedia article doesn't mention anything about a PhD as far as I can see, in particular it doesn't mention he didn't have one. According to https://inf.e

His wikipedia article doesn't mention anything about a PhD as far as I can see, in particular it doesn't mention he didn't have one. According to https://inf.ethz.ch/news-and-events/spotlights/jiri-matousek.html https://inf.ethz.ch/news-and-events/spotlights/jiri-matousek... he did have a doctorate.