Meet Our Pharmacy Staff

Donelle Slentz - Pharmacy Management Staff

Donelle Slentz is a native West Texan. She graduated from Denver City High School in 1979 and attended Texas A&M University in College Station, Texas. After moving to Midland in 1994, Donelle worked in real estate until 2000 when she became the general manager of Graham Pharmacy. Ms. Slentz became the owner of Graham Pharmacy in 2011 after the move to its current location on Wall Street.

Julio Castillo - Wall Street Location

Our Pharmacist-in-charge, Julio Castillo, PharmD, RPh, is a certified compounding pharmacist at our Wall Street location. Julio was raised in West Texas and graduated from Lamesa High School. After high school, he was a medic in the Air Force and went to Texas Tech University in Lubbock. Julio attended pharmacy school in Amarillo and received his Doctor of Pharmacy degree from Wilkes-Barre, Pennsylvania in 2002.

He has worked in retail pharmacy since 1991 as a pharmacy technician, intern staff pharmacist and currently our Wall Street Pharmacist- in-charge. He and his wife, Anna, have five children - Amber, Lucas, and triplets - Isabella, Samantha, and Alessandra.

Nathan Gammage - Briarwood Location

Nathan Gammage, RPh is our Pharmacist-in-charge at our Briarwood location. Nate was born and raised in Phoenix, AZ. After graduating high school, Nate attended the University of Arizona where he received a degree in history in 1992. He spent many summers during this time working as support staff in special events for USA Basketball which enabled him to travel the world. Nate then enrolled at Texas Southern Pharmacy school. Upon graduation, he went to work in and around the Houston area before settling in West Texas. Nate and his fiancee Heather, have two children Natalie and Nathan.