I don’t know about “biggest” :p but as someone without a graduate degree working in AI research, I’ve definitely felt imposter syndrome at times. One of the amazing things about working with large teams of research experts is that people bring extremely deep and diverse knowledge. Just on our team there are experts in NLP, reinforcement learning, game theory, systems engineering, and Diplomacy itself. When people are specialized in this way, the total knowledge on the team is much more than the knowledge of any individual, which is excellent for the team but was daunting for me at first! -JG