Dr. Sierra is from Chicago, IL. He moved to Mt. Calvary, WI and attended St. Lawrence Seminary for his high-school education. He, then, would devote twelve years pursuing further education at Marquette University. Dr. Sierra graduated with a double major in Biomedical Sciences, and Spanish for the Profession. He earned his Doctor of Dental Surgery from Marquette University. Dr. Sierra received the Outstanding Dental Senior Award from his fraternity Delta Sigma Delta.
Dr. Sierra completed a three-year specialty program in Advanced Prosthodontics and a Master of Science degree at Marquette University. He received extensive training in fixed, removable, maxillofacial, and implants. During his time as a resident, he received the Graduate School of Prosthodontics Scholarship. Dr. Sierra assisted dental students as an Adjunct Clinical Assistant Professor at Marquette University.