David Blake was appointed executive director of fixed income at Principal Global Investors, Des Moines, Iowa. Mr. Blake also will retain his duties as managing director of fixed-income portfolio management. He replaced Gloria Reeg. Sources said Ms. Reeg left because of personality clashes with James McCaughan, chief executive of Principal Global Investors. Ms. Reeg couldn't be reached for comment. A Principal spokeswoman said company policy prohibited her from discussing details of staff departures.