Y Combinator brings on new partners

Y Combinator, a growing venture fund, officially announced 4 new “part-time” partners today. Coming aboard are Justin.TV founders Emmett Shear and Justin Kan, Loopt founder Sam Altman and Posterous founder Garry Tan. Tan has been working as a designer-in-residence for the past year at YC while the other three have been helping with the notoriously but well-manged 10-minute interviews candidates go through.

The fund is known for helping super-early stage startups. After a three month summer program, the young (and sometimes older) entrepreneurs are put through the VC/investor ringer as they try to raise money for their ideas.

Head honcho Paul Graham wrote in a statement, “This may sound corny, but they also make YC a happier place.  We’ve known these guys for years (Sam, Emmett, and Justin were all in the very first YC batch in summer 2005) and have been through a lot with them.  They’re good eggs, and it’s nice to have them around.”

Its recent successful alumni include $200 million exits from its Heroku founders, who sold to Salesforce earlier this year.

Current partners include Graham, Jessica Livingston, Harj Taggert, Trevor Blackwell and Robert Morris.