I have had this picture hanging in my home for years and never knew the mans name was Otto Walker. These were true men of steel, moto-drome racing was about the most dangerous sport you could participate in during its time. It only lasted a few years and was gone by the end of the 1920's. These guys were going just shy of 100 mph on bikes that were just in their infancy and on tires that were very likely to blow and put you down !
Below is a link to a really amazing footage of original moto-drome racing. I got from The Jockey Journal site .
http://vimeo.com/51335139