r - Aug 1985 - June 1988 Dexter W Lehtinen - June 1988 - Jan. 1992 James G. McAdams - Jan 1992 - May 1992 Roberto Martinez - May 1992 - Sept 1993 Kendall Et Coffey - Oct 1993 - May 1996 Wiliam A. Keefer - June 1996 - Aug 1997 Thomas E. Scott - Aug. 1997 - May 2000 Guy A. Lewis - June 20O0 - Aug. 2002 Marcos D. Jimenez — Aug. 2002