Tianyi Peng
Assistant Professor
Columbia Business School
Tianyi Peng is an assistant professor in the Decision, Risk, and Operations division at Columbia Business School and a co-author of E-GEO, an e-commerce GEO testbed built around ranking objectives sellers can measure.
From MIT to Columbia
Peng received his PhD from MIT in 2023, advised by Vivek Farias, and joined Columbia Business School's DRO faculty. His research spans AI for decision-making, digital twins, and agentic systems, as listed on his personal site.
The E-GEO Benchmark
E-GEO pairs more than 13,000 intent-rich shopping queries with Amazon listings and evaluates rewriting strategies across generative engines. Its objective is mean rank improvement, a commercial metric sellers can translate into clicks and revenue. The paper also includes a red-team chapter on manipulation.