Daken J. Vanderburg joined Chartwell Investment Partners as a portfolio manager and director of quantitative research, said Timothy Riddle, Chartwellís CEO and managing partner. The position is new. Mr. Vanderburg will lead a new quantitative research team at Chartwell. He had been a partner and portfolio manager at Gamma Capital Advisors. Richard W. Cooper, a senior manager director with Gamma, wasnít immediately available for information on a replacement.