"[1] He subsequently created a direct-mail advertising business, then a mail-order company providing goods to members of the United States military in Vietnam.
He sold such items as cameras, watches and audio equipment, including Bose speakers and Revox tape recorders.
Following the end of the war in Vietnam, Heymann became the Hong Kong distributor for Bose and Revox, and, later, Studer recording studio equipment.
At this time, he also met his future wife, Japanese violinist Takako Nishizaki, who came to play as soloist with the Hong Kong Philharmonic.
[2] Heymann's desire to help his wife's career led him to start making her recordings, including that of the Chinese Butterfly Lovers' Violin Concerto with the Nagoya Philharmonic Orchestra.
[3] After this unexpected success, Heymann created a label called HK to record other works with the Hong Kong Philharmonic and the Singapore Symphony Orchestra.
[4] After initially recording in Hong Kong and Singapore, Heymann switched to eastern European countries, profiting from his connections with the Hungaroton and Opus labels, located in Hungary and Czechoslovakia, which he distributed.
Heymann claimed, in a 2007 interview with Stereophile Magazine, that he was only just making a "decent return" from the more than $80 million he invested in the company, "thanks to the advent of digital platforms.