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8440 Walnut Hill Lane Suite 500, Dallas, TX 75231

Dr. Mock (ENT) 214-345-1494

Our Team

Presley M. Mock, MD

Dr. Presley Mock is board certified in otolaryngology—head and neck surgery and is a Fellow of the American College of Surgeons. His office is located on the Presbyterian Hospital of Dallas campus, where he has served patients for 25 years. His practice encompasses pediatric ENT, sinus and nasal surgery, sleep apnea management, hearing and balance disorders, head and neck oncology, and care for the professional voice. His interests include the full spectrum of sinus surgery, from in-office minimally invasive procedures to complex revision surgery with intraoperative image- guided navigation. He also has a passion for treating voice patients and has helped student, amateur, and professional singers and speakers with their medical and surgical voice care.


Laurie Even, AuD

Laurie Even, Au.D., is a clinical audiologist that has been with Texas Medical and Surgical Associates for over 11 years.  She received her Doctorate in Audiology at University of Texas at Dallas, and her Bachelor of Science in Communication Sciences and Disorders at University of Texas at Austin.  She is a native Texan and currently resides in Farmers Branch with her husband, Bill, and two daughters, Annie and Emily.  

She is licensed by the State of Texas, is a member of the Texas Academy of Audiology, and a fellow with the American Academy of Audiology.  


Yijun Fan, MD

Dr Yijun Fan is a board certified rheumatologist and internist who has been caring for patients in Dallas for 20 years. He is a Fellow of the American College of Rheumatology and a member of the Texas and American Medical Associations. He earned his medical degree at Peking University Health Science Center in Beijing, China. He completed his residency in Internal Medicine at Nashville General Hospital and fellowship in Rheumatology at the University of Virginia. He is fluent in English and Mandarin. 
Dr Fan’s patients appreciate his unique blend of personal kindness and medical expertise. He has a special interest in immunology as the basis for inflammatory rheumatic disease and puts this knowledge into practice to diagnose and treat patients with autoimmune diseases such as Rheumatoid Arthritis, Psoriatic Arthritis, Ankylosing Spondylitis, Systemic Lupus Erythematosus, Dermatomyositis, and others.

Mary DeCardenas, PA-C

Mary DeCardenas has specialized in rheumatology since 2004 and has been practicing with Dr Fan since 2017. She completed the Physician Assistant Fellowship in Rheumatology at UT Southwestern Medical Center and the Dallas Veterans Affairs Medical Center. She is a Clinical Assistant Professor for the Department of Physician Assistant Studies at UT Southwestern where she earned a Master of Physician Assistant Studies in 2003. Mary is certified by the National Commission on Certification of Physician Assistants and licensed by the Texas Medical Board. 

Patients appreciate Mary’s thorough and empathetic approach to assessment of the whole person, whether addressing inflammatory and autoimmune disorders or chronic neurologic pain conditions. Prior to studying medicine, Mary earned an undergraduate degree in psychology at the University of Texas, held certification as a Massage Practitioner in California, and interned at the NASA Ames Research Center in support of biology research on the International Space Station.

Our History


The story of Texas Medical and Surgical Associates began back in 1927, when its first generation of doctors united to establish a clinic with the goal of providing area residents with excellent specialty care, originally known as the Dallas Medical and Surgical Clinic. 

A new generation of doctors stepped forward in 1994, and the clinic moved from its downtown facilities to the Walnut Hill Lane and Greenville Avenue location where it has provided patient care as Texas Medical and Surgical Associates for the past 25 years.

The leadership of TMSA continues to envision a bright future for the organization and its patients.

TMSA Alumni

Dr. Raleigh William Baird (1870 -1941)
Dr. Harold Medoris Doolittle (1877 -1950)
Dr. Joseph Wilbur Bourland, Sr. (1872 -1960)
Dr. Harry Metcalfe Spence (1905 -1994)
Dr. Ludwig A. Michael (1919 – 2015)