David Robert Filo (born April 20, 1966) is an American billionaire businessman and the co-founder of Yahoo!

His Filo Server Program, written in the C programming language, was the server-side software used to dynamically serve variable web pages, called Filo Server Pages, on visits to early versions of the Yahoo!

became very popular, and Filo and Yang realized the business potential and co-founded Yahoo!

[7][8] Filo is married to photographer and teacher Angela Buenning, a graduate of Stanford (1993) and Berkeley (1999).

[10][11][12] As of September 2019, Forbes estimated Filo to be worth $4.3 billion, ranking him the 379th-richest person in the world.