Dr. Gillen grew up in the Palm Beach Gardens/North Palm Beach area. He attended The Benjamin School, which led to his introduction to the PGA Animal Clinic. He began working for Dr. Giurato during his junior year of high school and continued to work during breaks while an undergrad at Auburn University in Alabama. Dr. Gillen earned his Bachelor of Science in Animal Sciences from Auburn University in 2008. He then attended St. Matthew’s University for veterinary school on Grand Cayman Island, where he completed his first three years. For his fourth and clinical year, he attended Purdue University in Indiana. After graduating in 2012, he began working for Dr. Giurato as an associate veterinarian at PGA Animal Clinic. In April 2014, Dr. Gillen purchased the practice. Dr. Gillen has a Golden Retriever, Mahi, and a terrier mix, Sunshine, as well as rabbits and various reptiles.