Rozanski was born March 11, 1955, in Goldbach, Bavaria, West Germany,[1][2] and later moved to the United States with his mother and stepfather, an American Army officer.

[1] As described by Rozanski, his stepfather was abusive, and his mother, originally from the German town of Goldbach, had mental illness due to trauma caused by her experiences during World War II.

[5] In 1969, when Rozanski was 13, he began working out of his parents' Colorado Springs basement, selling back issues of comic books by running mail-order ads in the magazine Rocket's Blast Comicollector.

[9] In 1980, Rozanski purchased a double-page ad in mainstream Marvel comics, listing prices for back issues he had for sale.

This ad, which was the first of its kind, was a departure from the general practice of the time for its inclusion of prices, which Rozanski explains was a way to educate non-collectors as to the value of their collections.

[11] Rozanski drives all over the U.S. to local comics shops in order to stock Mile High's back issue inventory.

[12][2] Rozanski was one of five people whose journey to and experiences at San Diego Comic Con were depicted in the 2011 Morgan Spurlock documentary Comic-Con Episode IV: A Fan's Hope.

[3] That year, Rozanski shared the news with his Mile High Comics customers as well: He announced his Bettie Pages persona in a newsletter that went out to his 118,000 subscribers in 2017.

Despite threats from groups like the Proud Boys, Rozanski defiantly hosts inclusive events, including drag shows, embodying resilience against intimidation tactics.