Manuel P. Santos, MD, is a psychiatrist at Mercy Hospital, Rockville Centre, New York. He also reviews annulment cases for the Marriage Tribunal of the Archdiocese of New York. Dr. Santos is a member of the Sexual Abuse Review Board for the Prelature of the Holy Cross and Opus Dei and also is a member of the Catholic Medical Association, CatholicTherapists.com, and the Society of Catholic Social Scientists.

Dr. Santos and his wife, Karee, designed and taught a pre-Cana marriage preparation course in New York City for two years. They write a monthly marriage advice column on CatholicMom.com called “Marriage Rx” and also contribute to FAITH magazine's “Marriage Matters” advice column. The couple lives in Garden City, New York, with their six children.