Holzer is born in Toronto, Canada, and married to American Rusty Holzer. She lives in New York City, U.S.A.
Holzer is a highly respected coach and has a huge string of high profile riders training with her, including Jill Irving, P.J. Rizvi, Eliane Cordia-van Reesema, Jacquie Brooks, Chris von Martels and Brittany Fraser.
Although Holzer is now sworn-in as a U.S. citizen, she has a dual citizenship. She has not yet revealed her plans if she will declare for the U.S.A. as a dressage rider. The FEI has a one-year sit and wait period before a rider can compete for his new nationality.