Dana K. Bilyeu was named executive officer of the $14 billion Nevada Public Employees' Retirement System, Carson City. She replaced George Pyne, who retired in July after nine years as executive officer. The executive officer, who reports to the board of trustees, is responsible for all programs of the system, including the investment program. Ms. Bilyeu had been with the system as the operations officer since January 1995. Before that, she was the system's legal counsel in the Nevada attorney general's office.