[1] In 1973, Demling signed with the St. Louis Stars of the North American Soccer League (NASL).
In 1978, Demling moved to the Major Indoor Soccer League (MISL) and signed with the Cincinnati Kids.
Demling played the 1980–1981 MISL season with the San Francisco Fog.
Demling played in the third U.S. game of the tournament, a 7–0 loss to West Germany.
Unlike his debut match, this one ended in a 7–0 loss for the U.S.[2] He coached Lindenwood Lions men's soccer.