 However, contemporary newspaper accounts and substantiated research, namely by Indianapolis Motor Speedway historian Donald Davidson, have produced no credible evidence to support the claim.Mulford was retroactively declared the National Driving Champion for 1911 and 1918.He retired from racing on tracks after 1922, but continued to compete for several more years in hill climbs, and – at one time – held the record for both the Mount Washington and Pikes Peak climbs.