Najjar was born to a Greek Orthodox ChristianLebanese family in Omaha, Nebraska.[3] He joined Ford Motor Company's Apprentice School in Dearborn, Michigan. While working there as a machinist, he was approached by Henry Ford during a plant tour who asked him if he enjoyed his work. Najjar's response that he'd "rather be drawing cars" led to an invitation for him to add his talents to Ford's newly created Design Center.[4]
He continued working as a designer for Ford for over 40 years. He worked with E. T. Gregorie, George Walker, Elwood Engel, Gene Bordinat, and Lee Iacocca. For many years his work was centered on futuristicshow cars whose revolutionary features later appeared in many Ford, Lincoln and Mercury vehicles.[5]
Najjar also co-designed jointly with fellow Ford Motor Company stylist Bill Schmidt the groundbreakingLincoln Futura, a futuristic concept car,[9] which debuted at the 1955 Chicago Auto Show. It that served as a base for the Batmobile for the 1966 TV series Batman, as well as for the first movie adaptation of the Batman comics.[10]
Najjar and his wife Virginia retired to Sarasota, Florida, in 1985.[11] Virginia died on March 29, 2005,[12] while Najjar died on January 26, 2011.