Harry Arminius Miller was an influential and famous American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 race car builder, most active in the 1920s and 1930s. In the opinion of noted American racing historian Griffith Borgeson

Griffith Borgeson

Griffith Borgeson was an influential American race car historian, described by the Society of Automotive Engineers as one of the world's preeminent automotive historians....

, Miller was "the greatest creative figure in the history of the American racing car".
Cars built by Miller won the Indianapolis 500

Indianapolis 500

The Indianapolis 500-Mile Race, also known as the Indianapolis 500, the 500 Miles at Indianapolis, the Indy 500 or The 500, is an American automobile race, held annually, typically on the last weekend in May at the Indianapolis Motor Speedway in Speedway, Indiana...

 nine times; three more instances were won by his engines running in other chassis. Miller cars accounted for no less than 83% of the Indy 500 fields between 1923 and 1928.

If Offenhauser

Offenhauser

Offenhauser was an American racing engine manufacturer that operated from 1933 to 1983.The Offenhauser engine, familiarly known as the "Offy", was developed by Fred Offenhauser and his employer Harry Arminius Miller, after maintaining and repairing a 1913 Peugeot Grand Prix car of the type which...

 engines, a re-badged Miller derivative, and the dominant engine at the Indy 500 and on the Champ car

Champ Car

Champ Car was the name for a class and specification of open wheel cars used in American Championship Car Racing for many decades, primarily for use in the Indianapolis 500 auto race...

 circuit in the 1950s and 1960s (although it kept winning until the 1970s) are added, the number of wins at Indianapolis alone increases by 28, with over 200 more elsewhere.