Jacobs is also an avid equestrian, having served on the United States Equestrian Team.
In 1930 he was a member of the U.S. Olympic Equestrian Team.
Mac Cone is the only rider to have ridden as a member of both the Canadian Equestrian Team and the United States Equestrian Team.
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After retiring as the American coach, he spent five years in Hamilton, Massachusetts as the Director of the United States Equestrian Team (USET) Training Center.
The cross-country course was designed by Captain Mark Phillips, Chef d'Equipe and Technical Advisor for the United States Equestrian Team and a former member of the Great Britain Olympic team.