While continuing to develop racing engines, the Duesenberg brothers and their financial backers, Newton E. Van Zandt and Luther M. Rankin, established the Duesenberg Automobile & Motors Company in March 1920 with its headquarters in Indianapolis. Fred was the chief engineer and later in the 1920s served as president of the company; his brother, Augie, was assistant engineer. Beginning in May 1921 the Duesenberg company manufactured passenger cars with advanced racing-car features at its new factory in Indianapolis at the corner of Washington and Harding Streets. The facility was also close to the Indianapolis Motor Speedway, which was used as a test track.