Ken Ziyu Liu is a Computer Science PhD student at the Stanford AI Lab, advised by Professors Percy Liang and Sanmi Koyejo. His research focuses on foundation models, data/user privacy, and their intersection. His recent work studies the privacy properties of AI, such as membership, memorization, and unlearning—and privacy tools for AI—such as anonymization, differential privacy, and federated learning. His work has earned spotlights at top venues, won 1st place at the US-UK PETs Prize, and has been deployed at scale on Android. Previously, Ken spent time at Google DeepMind, Carnegie Mellon University, Meta, Apple, and Amazon.