I’m a Director and Principal Data Scientist in Microsoft’s Core Search and AI group, where I contribute to the ChatGPT based New Bing. Prior to Microsoft I was a senior scientist/manager at Apple where I worked on teams that reinvented Apple Maps and launched the Apple Card. I’ve contributed to products used by hundreds of millions of people worldwide.

I’ve held academic positions at Columbia, Brown, and the University of Colorado where I was a tenured professor of Geography and Information Science and the university’s inaugural Chief Data Officer. As an academic I worked at the intersection of Maps and Data Science. I wrote Urban Analytics and lots of articles, I received a distinguished scholar award from the American Association of Geographers, and the Brehny Prize for work in Urban Analytics and City Science.

Before becoming a professor and data scientist I lived an insanely analog life as the sole propreitor of an antiquarian bookshop in Manhattan.