Cofounder and General Partner at Spark Capital. Spark currently manages over $4B across venture and venture growth funds. Led our investment in Twitter (NYSE: TWTR) in early 2008 and served on their board from 2008-2011. Also led the seed investment in Tumblr (acquired by Yahoo!) and served on their board of directors for the entire duration of the company. Other investments include: Stack Overflow (acquired by Prosus N.V.), Overtime, Crowdrise (acquired by GoFundMe), Trello (acquired by Atlassian), Sincerely (acquired by Liberty Interactive Corporation), RunKeeper (acquires by ASICS), Foursquare, Boxee (acquired by Samsung), OMGPOP (acquired by Zynga) and thePlatform (acquired by Comcast).