Margit Wennmachers is a venture capitalist at the Silicon Valley venture capital firm Andreessen Horowitz and a co-founder of OutCast Communications (now The OutCast Agency), one of the tech world's top public relations firms according to The New York Times.

[6][better source needed] She later moved to San Francisco to join Blanc & Otus, a high-tech communications firm.

By 2010, their clients had included Facebook, Autodesk, Amazon, Yahoo!, EMC, Netflix, Cisco, Zimbra and VMware, as well as Andreessen Horowitz.

[1] Wennmachers became a partner of Andreessen Horowitz in September 2010[7] to help identify and evaluate new start-ups for investment potential and advise the firm and its portfolio companies on marketing and branding.

[8] Andreessen Horowitz's investments include Twitter, Jawbone,[9] Facebook, Foursquare, Groupon, and Zynga.