As a post collegiate 1998–2009, Monique traveled the world competing as a Professional Track and Field Athlete. Hennagan was the silver medal recipient for women's relay at the 1998 Goodwill Games. At the 2001 Goodwill Games, Monique Hennagan won gold for the women's relay. In 2002 and 2003, Hennagan was a 2X USA Indoor 400m Champion. In 2000 and 2004, Hennagan won Sydney's and Athens’ Olympics, respectively, for the women’s relay; also, 4th place in 400m at the 2004 Olympic Trials. Hennagan earned 2nd place finisher at IAAF World Athletics Finals 400m. She received a gold medal for the women’s relay at the 2007 World Championship in Athletics. Monique Hennagan has been ranked “Top 8 in the World” three times, including 3rd place in the world, personal highest.