Alan Winkle, executive director of the $11.5 billion Idaho Public Employee Retirement System, Boise, will retire at the end of the year. He has been at the Idaho system for 22 years, including 20 years as executive director. Executive search firm EFL Associates is assisting the board in its search for a new executive director. Information about the job is available at http://www.persi.idaho.gov/jobs. Mr. Winkle said in an interview the board would probably start looking at applications in four to six weeks.