Meet Our Leaders

Mesquite Specialty Hospital is led by a team of highly experienced healthcare professionals who are passionate about providing the highest level of care available to the hospital’s patients.

We invite you to learn more about us below:

Meet our Leaders

Michael Ridgeway, Chief Executive Officer
Michael has 18yrs of experience as a registered nurse with 8 of those years in a nursing leadership role.  He is committed to providing excellent leadership and responsible for daily management of the hospital.

Michael’s broad and varied background includes clinical bedside experience in cardiovascular ICU, step-down unit, ortho trauma unit, telemetry unit, medical/surgical unit, and wound care.  He has also served as director of business and development and regional director of business and development.

In his free time, he enjoys spending time with his wife and 3 boys traveling, watching movies, and attending car shows.


Audrey Cason, Director of Case Management
Audrey is a true blue country girl from East Texas. She has always had a drive for hard work and serving others. Even as a young child she always dreamed of being a nurse. She worked and studied to make her dream a reality May 1982. She graduated from Texas Eastern School of Nursing in Tyler, Texas and passed her State Boards that year.

Nursing has allowed her many opportunities in various practice settings. One of the most challenging was working adult and pediatric oncology. “ My patients and families have taught me what a precious gift life is. It is important to see each challenge as an opportunity for learning something new and personal growth.”

As the Director of Case Management she keeps up to date on the fast pace changes in health care. She current serves as President-Elect for the Dallas Fort Worth Chapter of Case Management Society of America. She is the Public Policy Liaison to the National Public Policy committee of CMSA for the DFW chapter. In this role she is the point person increasing awareness of case management issues to Senators and Representatives and demystifying the political process for members of the local chapter. Also a member of the chapter of Association of Clinical Documentation Improvement Specialist.

Locally she is a graduate of Leadership Mesquite and is active in the Mesquite Chamber of Commerce.

In her current role as Director of Case Management, her passion is to help her team meet the individual and family needs of our patients through communication and available resources for successful outcomes.


Tristen Williams, OTR, Director of Therapy Operations
I have always been a nurturing individual since I was a little girl. It fulfills me to help make a difference in others’ livesIn high school, when it was time to start thinking about a career, I only saw fit to have a career in healthcare. My biology teacher introduced the idea of occupational therapy and I knew it was the perfect fit for me.  I graduated from the University of Central Arkansas with a Masters in Occupational Therapy in 2005. I absolutely love what I do.

Aside from work, I enjoy spending time with my family.  I have an older brother, a younger brother, an older sister, and nieces and nephews. I go back home to El Dorado, Arkansas to visit my mother often.


Mateen Shaw, Director of Pharmacy
Over 40 years of clinical experience, I started the clinical program in 1992 at one of the Tenet Hospitals, Doctors Hospital Dallas (now City Hospital) which improved patient outcomes for community acquired pneumonia by 1-1/2 day and decreased cost of antibiotic therapy for this DX by more than 50 %.  This work was a highlight presentation at the International Conference on Antimicrobial Agents and Chemotherapy (an international infectious disease conference) in 1995 and presented again in 1998.  I am also Adjunct Assist Professor, Department of Pharmacotherapy, College of Pharmacy, University of North Texas Health Science Center in Fort Worth.  With passion for patient care, but no tolerance for blood and gut, I chose the profession of pharmacy. One thing for sure, seeing the patients improve and the happiness on families and patients faces is what I live for. I graduated from Karachi University, College of Pharmacy (Pakistan) in 1973 with BPharm and BS in Biology and Chemistry.

My wife and I have four children. My wife gave up her supervisory position with Delta Airlines for her passion of cake decorating.  She has worn many cake decorating contests and she is also a Henna artist. My two daughters, like their mom, are artists with one of them also a doctor (at least one of my children got my DNA – HAHA). One of my sons is in engineering and the other is in healthcare.  Both my sons are continuing their studies.

My favorites sports teams are Dallas Stars and Dallas Cowboys.  My favorite past time is spending time with my family and outdoor activities with them including kayaking.

Mason Tumas, Director of Quality
I’ve been a RN for 2 years..I have a BSN in Nursing and am working on my MSN. I chose nursing as my profession because I am passionate about caring for others and being there for them in the most difficult times in their life. I have a sweet little boy, a wild dog, and I got married as soon as I graduated college. I don’t enjoy watching sports…at all. LOL. My favorite hobbies are hiking and road cycling.