GovernmentExecutive.com

Many federal employees lead double lives, doing something in their off hours that has nothing to do with their civil service work. But NASA aerospace engineer Mark Branch may have the coolest second life.

By day, Branch works as the technical lead in the electromagnetic test engineering section of the Goddard Space Flight Center in Greenbelt, Md., the Washington Post reports today. But at night, he becomes "DJ Scientific," cranking tunes at some of the hottest clubs in the Washington area.

"I may be the only rocket scientist hip-hop DJ in the country," says Branch. "My colleagues at NASA find it hard to believe that I spend my nights deejaying at nightclubs. The people I meet at the clubs can't believe that by day I supervise people testing instruments for satellites."