Born in Pakistan, Conrad J. Castellino was raised in a close Catholic family. He received his bachelor's degree in medicine and surgery from the University of London, as well as his premed certification.In the 1980s, Castellino moved to the United States and completed his internship at Providence Hospital in Washington, DC. He then completed his residency in internal medicine in New York, where he served as chief resident. He launched an internal medicine practice in California, which has been in operation for the last eighteen years. He has also mentored medical students and acts as a volunteer lecturer to nursing students. Castellino is married to his college soul mate, Doreen, and together they have two sons. After a near-fatal heart attack, he was told he could never work again, but his life is as productive as ever. He is the author of Even Doctors Have Heart Attacks.