Dr. Marr graduated with high honors from the Atlantic Veterinary College of Prince Edward Island, Canada, in 2000. Following graduation, she served as an intern at the Mid-Atlantic Equine Medical Center and accepted an ambulatory associate position at the end of that year. In 2002, Dr. Marr completed the acupuncture program offered at Tufts University.

Dr. Marr resides in Florida during the winter season. During the summer months, she is based in the Westchester, NY location and spends most of her time at shows in the Northeast, Michigan, and Kentucky.

She is a fierce competitor in the amateur-owner jumper division aboard a variety of her own horses.