sentences:  He was chairman, president and chief executive officer of the company from 2000 to December 31, 2018, and president and chief executive officer from 1999 to 2000.Mehrabian held various senior executive positions at Allegheny Teledyne Incorporated (ATI) starting in July 1997, prior to the spin-off of Teledyne Technologies Incorporated in November 1999.Previously he was president of Carnegie Mellon University from 1990 to 1997.