
Dr. Castellano completed his undergraduate training in 1986, at St. Mary's University in San Antonio, Texas. He graduated Magna Cum Laude with a Bachelor's Degree in biology. Upon graduation he attended the University of Texas Dental Branch in Houston and received his DDS degree in 1990. Dr Castellano then completed a one-year residency in advanced general dentistry and later a two year residency to specialize in pediatric dentistry. Both were competed at the University of Texas Health Science Center in San Antonio, Texas (UTHSC-SA) Dr. Castellano is board certified in pediatric dentistry.