He was born in Vienna, and emigrated to the U.S. at the onset of World War II to escape the Nazi persecution which took his parents' lives.
Many of these photos were published in the book This Was Toscanini, (1963) accompanying an uncompleted essay by Samuel Antek, a violinist in the NBC Symphony.
Later, those and several more photos were used as cover art for RCA LP and CD reissues of Toscanini's recordings.
In the late 1980s, Hupka worked with engineers at NBC International on the audio/video synchronization of the ten Toscanini telecasts, which were finally issued by RCA in the early 1990s.
Hupka was also the author of Michelangelo: Pieta, a collection of a hundred photographs, from various angles and with different lighting, of Michelangelo's Pieta, taken in 1964 when this sculpture was exhibited at the New York World's Fair.