Zhengguo Gu is a senior data science leader and statistician with a focus on experimentation, causal inference, and statistical methodology. He currently serves as Senior Staff Statistician at Optimizely, where he leads the development of the Stats Engine. His work includes A/B testing, sequential analysis, Bayesian inference, and simulation-based sample size planning.

Before joining Optimizely, Zhengguo worked on measurement and experimentation in digital marketing at Booking.com, focusing on improving attribution accuracy and evaluating channel performance using principled statistical methods. Before that, at bol.com, Zhengguo played a central role in advancing experimentation and statistical methods within the organization. He supported product teams in designing and analyzing A/B tests, longitudinal studies, and quasi-experiments, using both frequentist and Bayesian approaches.