#9 Sergey Brin and Anne WojcickiAmount donated in 2013: $219 million
Net worth: $24.4 billion
Beneficiary: Brian Wojcicki Foundation in Palo Alto, Calif. and Michael J. Fox Foundation for Parkinsons Research in New York, N.Y.
Background: Sergey Brin co-founded Google, and Anne Wojcicki is a biotechnology analyst who co-founded the genetic-testing company, 23andME. Brin and Wojcicki had earlier given nearly $95 million to the Michael J. Fox foundation.