Marianne has been active in the sport mostly as a competitor. She started as a foil fencer, winning many medals, including gold medals in the Mid-Atlantic and Southeast Regional Championships. In New Jersey she took first place in the Garden State Games. She has been a member of the U.S. Veterans Epee team eight times, taking the gold medal in three national championships. In 2010 she earned a bronze medal at the Veteran World Championships in Croatia.
Marianne assists with the training of beginner fencers. Her main function is sharing her many years of local, national, and international competitive experiences with the students. So, with training provided by Mr. Bosco and competitive teaching by Mrs. Bosco, the students are provided with a well rounded and complete approach to the sport.