7510 North Beach Street Fort Worth, TX | 817-498-1818


  • Doctor David Simonak DO
  • Doctor Ryan Simonak DO
  • NP Robin Sustala APRN
  • PA-C Jake Duncan
  • NP FNP-C Isatu Wellington
  • Office Staff

Our Providers

Doctor David Simonak, DO


Dr. Simonak is board certified by the American Osteopathic Board of Family Practice and has been practicing medicine in Summerfields/Fort Worth for over twenty seven years. He received his undergraduate degree in Biology with Highest Honors from Lamar University in Beaumont, Texas and medical degree from the Texas College of Osteopathic Medicine/University of North Texas Health Science Center.  He completed his Family Medicine training at Ohio University, Doctors Hospital.
Dr. Simonak enjoys the challenge of medicine and impacting the lives of his patients. He and his wife have three grown sons: Dr. Ryan Simonak, Family Practice Physician (who will join his father at Fossil Creek Family Medical Center), Brady (Resident in Family Practice.) and Reese ( Is attending College.) He enjoys watching sports, hunting, fishing, traveling, playing guitar, and spending time with family and friends. He is an active member of Good Shepherd Catholic Church.
Work Address:
7510 North Beach Street
Fort Worth, TX 76137
University of North Texas Health Science Center, June 1982 Graduate
Family Medicine Training Doctors Hospital/Ohio University, Columbus, OH
Licensure and Board Certification:
AOA Board Certified Family Practice
Hospital Appointments:
North Hills Hospital, General Medical Staff
Medical Center Alliance
Tarrant County Medical Society
American Osteopathic Association
Texas Medical Association
American College of Family Physicians
Awards and Honors:
Outstanding Young Men in America
Southlake Senior High School Football Team Physician
Nolan Catholic High School Team Physician
Associate Professor Family Medicine Department UNTHSC/TCOM 1988-Present

Doctor Ryan Simonak, DO

Dr. Ryan Simonak joined the Fossil Creek Family Medical Center in practice the summer of 2015. He is very excited to join his father in practice & strives to carry on the provision of high quality patient care.

His passion for learning & playing football carried him to Rice University where he received a biochemistry BS and a history BA, while earning a starting position as a wide receiver & special teams. He earned his medical degree from the Texas College of Osteopathic Medicine and then completed residency in family medicine at Trident Health Center / Medical University of South Carolina. He remained in Charleston, SC, for 3 years working at Doctors Care, an urgent care / family medicine clinic.

Dr. Simonak is honored to be involved in his patient's health and aims to positively impact his patients' lives. He enjoys time with family & friends through hunting, fishing, biking, playing guitar, & reading.

He & his wife, Ashley, are the proud parents to their 2 year old son Luke, and newborn daughter, Madelyn.


Internship & Residency in Family Medicine at Trident Health Center / Medical University of South Carolina, Charleston, SC, June 2012 graduate

University of North Texas Health Science Center, June 2009 graduate

Rice University, Biochemistry & History, May 2005 graduate

Nolan Catholic High School, May 2000 graduate

Licensure & Board Certification:

Board Certified by the American Board of Family Medicine

Hospital Appointments:

North Hills Hospital, General Medical Staff


American Osteopathic Association

American College of Family Physicians

Texas Medical Association


NP Robin Sustala, APRN

We welcomed Robin Sustala, APRN to our practice on November 18, 2013. Robin was born in Waco, TX and grew up in Garden City, KS. She obtained her Associate Degree of Nursing at Garden City Community College and went on to obtain her Bachelors of Science in Nursing at Kansas Neuman University.  After working in ICU and as a nursing instructor, she completed her Nurse Practitioner requirements at the University of Kansas Medical Center.

Robin views nursing as a way to help others, but also help herself.  Nursing is an ever learning profession. Not just book learning, but primarily what we learn from our patients.

Robin has a nine year old son and together they enjoy reading, biking, and anything to do with Science.

PA-C Jake Duncan

We welcomed Jake Duncan, PA-C to our practice on December 2, 2013. Jake relocated from Ohio to Texas where he was born and has family and friends. Jake previously  practiced at an Urgent Care facility in Indiana and is excited to be a part of caring for our patients here in the Fort Worth area. Jake attended the Physician Assistant program at Trevecca Nazarene University where he graduated in August, 2012. Jake is a great asset to our practice.   


Jake is married to Brittany and has a one year old daughter Rosalie.

NP FNP-C Isatu Wellington

We’re excited to welcome Isatu Wellington, our new Nurse Practitioner. Isatu joined Fossil Creek Family Medical in June 2015. She previously worked at Minute Clinic/CVS Health, after attaining her Master of Science from Texas Woman’s University. While in school for her MS degree, Isatu worked at Texas Presbyterian Hospital in Flower Mound for three years. Prior to that, she worked at Methodist Charlton Hospital after nursing school, obtaining her Bachelor of Science in 2007. Isatu loves hanging out with friends and family, reading and attending church. She also loves traveling and experiencing other cultures.

Office Staff

Dr. Simonak is blessed to have an AWESOME staff!  You will find knowledgeable, competent, and friendly people from the time you are greeted until you check out!!!  We know your visit  will be a positive experience!!!  Thanks for allowing us to engage in your health care needs!!!