Catherine Williams, PhD - Chief Data Science Officer, AppNexus, USA

As Chief Data Scientist, Catherine Williams leads the Data Science function at AppNexus, whose dual mission is to design innovative and effective algorithms to achieve product and company goals, and to support client-facing field teams in their reporting, analytics, and story-telling needs. Both aims span and enhance buy-side optimization, sell-side optimization, anti-fraud, budget, and marketplace design, and ultimately empower clients through data.

Earlier in her AppNexus career, Williams worked as Manager of Quantitative Analytics and Co-Head of Optimization Engineering. She has also worked as a software test engineer at Microsoft.

She has a BA in Mathematics with honors from Grinnell College; a PhD in Mathematics from University of Washington, Seattle; and has held post-doctoral positions at Stanford and Columbia University.