Abraham Jacob Watson was born in Mansfield, Ohio in 1924 and served in the United States Army Air Forces during the Second World War as a B-17 navigator trainee. After the war he relocated to southern California and first attempted to qualify for the Indianapolis 500 in 1948, missing the race. He returned the following year with a home-built car that also failed to qualify. From 1950 onward, however, his cars not only made the field consistently but regularly ran at the front.
Watson worked initially as a crew chief, winning the Indianapolis 500 in that capacity in 1955 with Bob Sweikert. His transition to car builder came through an association with the John Zink team from 1955 to 1958, and subsequently with Bob Wilke from 1959 onward.
Watson's first victory as a car builder came in 1956 when Pat Flaherty drove the John Zink entry to victory at Indianapolis. Over the following years, Watson's roadsters dominated the Brickyard in a way few builders had achieved. Rodger Ward drove Watson cars to 18 victories during their partnership, and the combination became one of the defining relationships in American oval racing. Ward's wins included multiple Indianapolis 500 victories.
The Watson Roadster embodied the engineering priorities of the American Championship Car circuit: maximum mechanical reliability on ovals, efficient power transfer from the offset-mounted engine through a robust driveline, and a low slung chassis that kept weight low on banked turns. The cars were hand-built, reflecting Watson's background as a mechanic and fabricator rather than a formal engineer. The combination of craft-level construction with deep empirical understanding of Indianapolis-specific demands allowed Watson to stay competitive through a period of intense technical development.
Watson's cars dominated Indianapolis so thoroughly through the late 1950s and into the mid-1960s that rival constructors frequently attempted to reverse-engineer or closely follow his designs. The Roadster formula he refined — front-engined, Offenhauser-powered, with carefully developed suspension geometry for the slightly banked oval — became effectively the standard against which all American Champ Car builders measured themselves.
The defining challenge to Watson's dominance came from an unexpected direction. When Lotus brought rear-engined cars to Indianapolis in the early 1960s, following the layout that had by then become universal in European Formula One, Watson and many established American builders were initially resistant. The conventional wisdom in American oval racing held that rear-engined cars were unsuited to the demands of the long Indianapolis ovals, where straight-line traction and mechanical durability mattered more than the handling advantages rear-engined layouts offered on twisting road courses.
By 1964, the evidence was conclusive: rear-engined cars offered lower weight, better aerodynamic packaging, and superior weight distribution that also benefited oval racing. Watson responded by building a pair of vehicles based on the successful design from Rolla Vollstedt. These worked reasonably well in competition but could not reproduce the winning record Watson had established with his front-engined roadsters.
Subsequent attempts at rear-engined cars in 1966 and 1967 using monocoque construction brought ever-diminishing results. Watson continued entering cars at Indianapolis until 1984, spanning a 35-year participation in the event, but his cars never regained the commanding form of the roadster era.
Watson was inducted into the National Sprint Car Hall of Fame in 1993 and the Motorsports Hall of Fame of America in 1996. He died in Indianapolis, Indiana on May 12, 2014, aged 90. His roadsters remain among the most successful purpose-built Indianapolis cars of the front-engined era, and the association between Watson's chassis and the Offenhauser engine stands as one of the most successful pairings in American racing history. During his final years Watson was frequently listed on Indianapolis 500 entry sheets as race strategist for PDM Racing, though his role was largely honorary — a recognition of his decades of contributions to the event that had defined his career.