Buck Olsen has been named chief executive officer of the Foster Group Inc., an independent advisory firm located in Des Moines, Iowa, and Omaha, Neb. He will take over the job on January 1, the firm announced Thursday.

Olsen joined Foster in 2000 and has held numerous positions within the firm, most recently leading the Advisory Services Group. Current CEO Mark Stadtlander will continue at the firm playing a key role in the transition and culture, the firm says.

Over the past 15 years, the Foster Group has grown from 300 clients to more than 1,000 and from $200 million in assets under management to more than $1.6 billion.