David Sze is a venture capitalist and partner at Greylock Partners, one of the most prestigious venture capital firms in the world. He has been with Greylock since 2005 and has invested in some of the most successful technology companies of the past decade, including Facebook, LinkedIn, Dropbox
From Wikipedia
Greylock Partners is one of the oldest venture capital firms, founded in 1965, with committed capital of over $3.5 billion under management. The firm focuses on early-stage companies in consumer and enterprise software.