David F. Merrion is a mechanical engineer who is the retired Executive Vice President of Engineering for Detroit Diesel Corporation, now a subsidiary of Daimler Trucks North America. He was with GM’s Detroit Diesel for 34 years and Roger Penske’s DDC for 12 years. His previous consulting company, David F. Merrion LLC, was formed in 2000 and now continues as Merrion Expert Consulting LLC for engineering consulting and expert witness consulting.