Boehm was also very popular in the 1950s in the German SISSI films, as Emperor Franz Joseph opposite teenage Romy Schneider as the Austrian Empress Elizabeth. They made 3 SISSI films (there is a compilation film FOREVER MY LOVE). He also played Beethoven for Walt Disney (which I remember seeing as a kid), and co-starred with Dolores Hart in the 1963 comedy COME FLY WITH ME, as well as playing one of the Grimm Brothers in THE WONDERFUL WORLD OF THE BROTHERS GRIMM, and in Minnelli's FOUR HORSEMEN OF THE APOCALYPSE, both 1962. His career revived in the 1970s with 4 films for Rainer Fassbinder, the best of which was FOX AND HIS FRIENDS (see German label). He later become involved in charity work in Ethiopia - leaving his 4th wife, an Ethiopian, to survive him.
PEEPING TOM will endure as long as PSYCHO in cinema annals as among the key films of 1960, not least for Boehm's interpretation of the killer cameraman.