George Scangos, CEO of Biogen (Nasdaq:BIIB) said he is stepping down to spend time with his family on the West Coast.

The company disclosed the Scangos announcement with its second quarter earnings report. Scangos has been CEO for six years.

The company said it will begin an immediate internal and external search for his replacement. It expects the transition to take a few months, with Scangos continuing as CEO in the meantime.

Biogen employs 1,300 people at its Research Triangle Park manufacturing facility.

Biogen earnings topped analysts’ forecasts with $2.9 billion in revenue.

In a statement, Scangos said,“The past six years have been quite successful. We have introduced six new products onto the market, increased our earnings and revenues several fold, and transformed our R&D and commercial organizations to world-class levels, joining our already industry leading biologics manufacturing capabilities.”