Mark has been a USA member from the early days of 1978.
He has served as a member of USA Executive Board from 1988 to Present. Mark received USA Performance Judges license in 1992. He has been the USA Director of Judges in 1996 to Present.
Mark has judged the USA FH Championship, USA National Championship, the USA World Qualifier, Performance Judge since 2001 at the USA Sieger Show, the National Championship of South Africa, and other trials abroad.
Mark has been a tracklayer multiple times for Regional Championships, USA National Schutzhund 3 Championship, USA North American Championship, USA FH Championship, and USA World Qualifier.
Mark is a USA Teaching helper. He has been the helper at numerous Regional Championships, USA National Schutzhund 3 Championship, USA World Qualifier, USA North American Schutzhund 3 Championship, AWDF Championship.
He is a two time member of the USA SchH 3 Club. Finished 2nd in the 1998 USA FH Championship.