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In 1915, she became the first performer to star in a Broadway ice show, appearing in Hip-Hip-Hooray! at the New York Hippodrome.
Wirtz was an important showbiz figure with his presentation of the Sonja Henie Ice Show, which toured arenas for many years.
In October 2013 he took part in the St. Petersburg's production of "Opera on Ice" show and performed together with renowned musicians and singers Edvin Marton, Caroline Sandgren, Vasily Gerello as well as figure skaters Evgeni Plushenko, Naomi Lang and Peter Tchernyshev.
From 2002 until 2007 he was artistic director of the ice show at Europa-Park.