Meet Our Doctors

Dr. Ron Weich is a 1994 graduate of Ross University and joined the practice in 1995; he has been owner since 2010.  His areas of interest include: ophthalmology, internal medicine, and soft tissue surgery. He is a private pilot, and enjoys motorcycle touring, as well as spending time with his family.

Dr. Misty Callaham attended undergraduate and veterinary school at Texas A&M University. She joined the Crossroads Animal Hospital team in 2002, and became Dr. Weich’s business partner in 2015.  Her interests include soft tissue surgery, orthopedic surgeries, and cardiology. Misty enjoys running, skiing, and spending time with her family.

Dr. Mark Lenox is from Dallas, Texas and graduated from Texas A&M University in 1984. His areas of interest are soft tissue surgeries and exotic animals. He enjoys photography, golf, training for triathlons and spending time with his dog Buster.

Dr. Sharon Joslin-Ortiz grew up in a military family and traveled all over the world. She graduated from Texas A&M University in 1989. Her area of interest is internal medicine. She's an avid swimmer, enjoys spending time with her family, and is very committed to studying the bible.

Dr. Margie Zavala, a native El Pasoan, graduated from Texas A&M University in 1997 and joined the practice in 1999. Her interests include: dermatology and internal medicine. Her hobbies are reading non-fiction, cooking and spending time with her husband, two sons and daughter.

Dr. Lauren Keim is an El Paso native that went to St. George's University and completed her fourth year at Oklahoma State University. She was delighted to come back home and join the Crossroads family. Dr . Keim is enthusiastic about providing client education and fostering the human-animal bond. A few of her interests include general medicine, dermatology, pain management and she loves soft tissue surgery. She enjoys cooking, traveling and spending time with family and friends. Dr. Keim is absolutely crazy about her two dogs, Chile and Swagger.