Medical Director

Bristow Endeavor Healthcare is proud to introduce Dr. Bradley Lowery, MD.

Dr. Lowery provides oversight for the Emergency Departments at both CORE and Bristow Medical Center as well as our Family Practice clinics. 

Dr. Lowery attended the University of Oklahoma where he obtained a Bachelor’s Degree in Chemical Engineering in 1986. He completed his internship in General Surgery at the University of Oklahoma College of Medicine in Tulsa in 1989 followed by his residency in Family Medicine at the same facility in 1992. 

Dr. Lowery has provided Emergency Medicine and Hospitalist services to Bristow Medical Center since 2006, and expanded his affiliation by providing the same care at our CORE location beginning in 2015. Prior to working with Bristow Endeavor Healthcare, Dr. Lowery elevated his professional skills at Hillcrest Medical Group, OMNI Medical Group at St. John Medical Center, Eastern Oklahoma Medical Center, and Newman Memorial Hospital. 

Dr. Lowery oversees the providers in the Emergency Departments at CORE, and he does so by instilling enthusiasm for patient care, encouraging providers to refine their skills by continuing their education, and providing valuable expertise in the field of Emergency Medicine.


Dr. Blackmon specializes in orthopaedic surgery, sports medicine and foot and ankle surgery. His special interests include minimally invasive surgery and reconstructive surgery.  He works with a wide variety of patients, from weekend warriors to young athletes, to help them recover and resume the activities they enjoy.

  • Orthopaedic Surgery
  • Fellowship Trained in Sports Medicine and Foot and Ankle Surgery
  • Sports Medicine
  • Foot and Ankle Disorders
  • Arthroscopy and Reconstructive Surgery
  • MD: Meharry Medical College, Nashville, Tennessee 1996
  • Residency: Fletcher Allen Health Care, University of Vermont 2001
  • Fellowship: Institute for Bone & Joint Disorders, Phoenix, Arizona 2002
  • Served eight years as a surgical technician in the U.S. Air Force Reserves.
  • Currently in the U.S. Navy Reserves in Tulsa providing services as an orthopaedic surgeon. Deployed to Afghanistan in support of the 325th Combat Field Hospital for eight months in 2004-2005.
  • American Academy of Orthopaedic Surgeons
  • American Orthopaedic Foot & Ankle Society
  • Tulsa County Medical Society

Dr. Blackmon and his family chose Tulsa to establish his medical practice after visiting many locations across the United States. Attracted to Tulsa for its medical and hometown community, excellent schools, and music opportunities for their children, they are active members of the community.

Dr. Blackmon’s interests include sports, music, boating and fishing, and photography.

Dr. Chalkin specializes in hand and upper extremity surgery, including hand, wrist, elbow and shoulder. He is expert in minimally invasive surgery as well as advanced reconstructive techniques, and is credited with the development of new orthopeadic implants used nationally.

  • Board Certified and Fellowship Trained Hand and Upper Extremity Surgeon
  • Board Certified Orthopaedic Surgeon
  • Surgery of the Hand, Wrist, Elbow, and Shoulder
  • Complex Shoulder and Elbow Arthoplasty and Traumatic Reconstruction
  • Tendon and Nerve Repair, Carpal Tunnel Syndrome, Degenerative/Rheumatoid Arthritis, and Wrist Fractures
  • General Orthopaedic Surgery

Dr. Chalkin graduated from Rutgers College/Rutgers University and from New York College of Osteopathic Medicine with honors. Following his orthopaedic surgery residency at Oklahoma State University he completed the coveted Hand and Upper Extremity Fellowship at the Curtis National Hand Center in Baltimore. Dr. Chalkin lectures nationally and teaches Oklahoma State University orthopaedic surgery residents new advanced techniques in hand, elbow, and shoulder surgery.

  • American Academy of Orthopaedic Surgery (AAOS)
  • American Osteopathic Academy of Orthopaedic Surgeons (AOAO)
  • American Osteopathic Academy (AOA)
  • Oklahoma Osteopathic Association (OOA)
  • Tulsa County Medical Society
  • Tulsa Orthopaedic Society

Dr. Chalkin resides with his family in Tulsa, Oklahoma. He enjoys fitness activities, is an avid snow skier, and takes pleasure in spending time with his family and friends.

Dr. Holt is board certified and fellowship trained in orthopaedic surgery, as well as fellowship trained in sports medicine. His special interests include surgery and reconstruction of the knee, elbow and shoulder as well as all types of sports medicine.

  • Board Certified in Orthopaedic Surgery
  • Fellowship Trained in Sports Medicine and Orthopaedic Surgery
  • Sports Medicine, Joint Arthroscopy and Reconstruction, Elbow, Knee, Shoulder.
  • Computer Assisted Surgery of the Knee.
  • Medical School: University of Oklahoma, 1986
  • Residency: Tampa Orthopedic Program, Chief Resident, 1993
  • Fellowship: Johns Hopkins University, Orthopedic Sports Medicine, 1994
  • American Board of Orthopaedic Surgery
  • American Academy of Orthopaedic Surgeons
  • American Medical Association
  • Oklahoma State Medical Association
  • Tulsa County Medical Society

Dr. Holt resides in Tulsa. His community involvement includes being active on the board of the University of Tulsa Alumni. He supports many other nonprofit organizations in Tulsa and surrounding communities, and is a sponsor of many local sporting events. Dr. Holt has served as a team physician for the Tulsa Talons, Tulsa Oilers and several area high schools, including Broken Arrow, Metro Christian Academy, Sapulpa and Bixby. He has completed 15 marathons in the past 10 years and is an avid basketball player.

Dr. Mittal is one of the only orthopedic surgeons in the Tulsa area with expertise in the direct anterior approach to hip replacement. He is also experienced in the most advanced knee replacement options including MAKOplasty® partial knee resurfacing.

  • Fellowship Trained in Adult Hip and Knee Reconstruction
  • Fellowship Trained in Diseases of the Hip and Knee
  • Board Certified in Orthopaedic Surgery
  • Total Joint-Replacement
  • MAKOplasty® Partial Knee Resurfacing
  • MAKOplasty® Total Hip Replacement
  • Computer and Robotic Assist Surgery of the Hip and Knee
  • Direct Anterior Approach to Total Hip Replacement
  • Sports Medicine
  • Hip/Knee Arthroscopy
  • Stem Cell Regenerative Therapy
  • Platelet Rich Plasma Therapy (PRP)
  • Fracture Care and General Orthopaedics
  • Undergraduate: Baylor University, 1994
  • Medical School: University of Texas Southwestern Medical School, 1998
  • Residency: John Peter Smith Hospital, Chief Resident, 2003
  • Fellowship: OrthoCarolina, 2004

Dr. Mittal has been instrumental in the continued development of robotic and computer assisted surgery (CAS) in joint replacement. He trains surgeons around the country on computer assisted navigation and robotic surgical techniques. He routinely lectures on a national and international level on all aspects of joint replacement.  Dr. Mittal is currently working to design new instruments and implants and is well versed in joint preservation techniques such as stem cell regenerative therapy and cartilage transplantation.

  • Acute Care Episode: CMS Bundled Payment: The Answer to Healthcare Reform?; Principal Investigator
  • The Benefits of Platelet Rich Plasma on Total Joint Arthroplasty; Principal Investigator
  • Does Aquacel Dressing Decrease the Risk of Infection in Hip Fractures?; Convatec
  • Triathlon TS Study; Stryker
  • Rejuvenate Hip Study; Stryker
  • Mechanisms to Decrease Acute Peri-/Post-Operative Blood Loss in Total Joint Arthroplasty; Submission Pending
  • Two-Stage Reimplantation in Periprosthetic Knee Infections with Resistant Organisms; Charlotte Orthopedic Specialists, Charlotte, North Carolina (Published in Journal of Bone/Joint Surgery 2007, Presented 2004 – American Association of the Hip & Knee Society)
  • Infection Rates in Revision Knee Arthroplasty with Metal-Metal Wear; Texas Hip and Knee Center, Fort Worth, Texas (Presented 2003 – American Academy of Orthopaedic Surgeons, 2002 – Texas Orthopaedic Association)
  • Periprosthetic Acetabular Fractures; OrthoCarolina, Charlotte, North Carolina

  • Dr. Palomino is an experienced orthopaedic surgeon specializing in Sports Medicine and Arthroscopic Surgery.  He specializes in complex shoulder and knee reconstruction as well as other muculoskeletal injuries.

    • Board Certified in Orthopaedic Surgery
    • Fellowship Trained in Sports Medicine and Arthroscopic Surgery

    Dr. Palomino earned his medical degree from Michigan State University in 1998 before completing his orthopaedic residency at Des Peres hospital in Saint Louis . Dr. Palomino served two years as chief resident. He then completed his sports medicine fellowship at The Christ Hospital Bone and Joint Institute/Wellington Orthopedic & Sports Medicine, in Cincinnati , Ohio.

    During his fellowship he was actively involved in the care of professional athletes (Cincinnati Bengals), collegiate athletes (University of Cincinnati men’s football, basketball, women’s soccer), and local high school teams.

    He is Board Certified and Fellowship trained to provide expert care in complex shoulder and knee reconstruction; as well as provide operative and non-operative treatment for a wide range of musculoskeletal injuries.


  • Fellowship: Lemak American Sports Medicine Institute, Birmingham, AL 2017
  • Residency: Orthopaedic Surgery, Oklahoma State University, Tulsa, OK 2016
  • Doctor of Osteopathy: Michigan State College of Osteopathic Medicine 2011
  • Bachelor of Science: Biology – Calvin College, Grand Rapids, MI 2007


Arthroscopic Shoulder, Hip & Knee Surgery, ACL Reconstruction, Rotator Cuff Repair, UCL Reconstructions, Fracture Care, Arthroplasty & General Orthopaedic Care.


  • North American Spine Society
  • American Medical Association
  • Puerto Rico Society of Orthopaedic Surgeons
  • Disorders of the cervical and lumbar spine
  • Arthritis of the spine
  • Minimally invasive spine surgery
  • Lateral fusion surgery
  • Ranked number 1 in the world for Nuvasive and Zimmer Biomet spine surgery techniques in terms of the number of lateral procedures performed per year
  • Fellowship: Harvard Medical School, Boston MA (2007)
  • Residency: University of Puerto Rico School of Medicine, Puerto Rico (2006)
  • MD: University of Puerto Rico School of Medicine, Puerto Rico, Magna Cum Laude (2001)
  • BS: University of Puerto Rico, Puerto Rico (1997)


Phone: (918) 813-3901

Fax: (918) 209-4915

Address: 505 E Main Street, Jenks, OK 74037


  • Fellow of American College of Foot and Ankle Surgeons
  • Oklahoma Podiatric Medical Association
  • American Podiatric Medical Association
  • Foot and ankle disorders/deformity
  • Bunions
  • Toenail pathology
  • Preventative diabetic foot care
  • Hammertoe surgery
  • Plantar Fasciitis surgery
  • Wound care
  • BS: Oklahoma State University (2004)
  • Residency: Benedictine Hospital Podiatric Program, New York (2011)
  • DPM: Des Moines University, College of Podiatric Medicine and Surgery, Iowa (2008)
Emergency Medicine


Emergency Department and Hospitalist Advance Practice Nurse Practitioner


Board Certificati


Certified in Adult/Gerontology Acute Care Nurse Practitioner

Certified in Emergency Nurse Practitioner

Certified in Family Practice Nurse Practitioner



Post Masters Certificate- Adult/Gerontology Acute Care Nurse Practitioner/ Emergency Nurse Practitioner – Vanderbilt University. Nashville, TN 2019

Masters Science in Nursing- Family Nurse Practitioner- Frontier University. Hayden, Ky. 2015

Bachelor Science in Nurs

ing- Langston University. Tulsa, Ok. 2004

Associates of Arts- Tulsa Community College. 2001


Professional Society Memberships

American Academy of Nurse 


American Academy of Emergency Nurse Practitioners            

American Association of Critical Care Nurses                               

American Nurses Credentialing Center

Ashley Yuras is from Oklahoma and graduated from the University of South Alabama with a graduate degree. Prior to becoming a nurse practitioner, she worked as an RN at Saint Francis Emergency Room in Tulsa, Oklahoma and was named Nurse Mentor of the Year in 2011. She also served as a charge nurse. While working ER and attending NP school, she met her husband Bryan Yuras, and they now reside in Jenks. In addition to CORE, she has worked as a NP in Bristow and Drumright, providing care to the surrounding rural communities. 

Ashley provides care to patients in the ER as a hospitalist, and provides post-operative care to orthopedic patients. She is a member of the Emergency Nurse Practitioners Association and holds a leadership role as an advocate for Oklahoma and she was recently named Oklahoma’s Top 40 under 40 for 2021.  Ashley enjoys spending time with her husband (Bryan), 4 year old daughter (Calysee) and 7 month old twin boys (Easton and Kingston). In her spare time she enjoys traveling, outdoor activities, chasing the dog Gabbie and running her business, Zyia Active.

Bariatric and General Surgery

Dr. Crapse began his surgical bariatrics in 1999 when as a senior surgical resident he spent three months of training, assisting, and performing both open and laparoscopic roux-en-Y gastric bypass procedures. Dr. Crapse was the first assistant on the very first laparoscopic roux-en-Y gastric bypass performed in Oklahoma. Few people realize that most weight loss surgeries have a gastric sleeve or some modification of it included in the procedure. Dr. Crapse has performed gastric sleeve surgeries for both gastric and esophageal cancers throughout his career.

By 2006, Dr. Crapse was both performing and teaching surgical residents at then Tulsa Regional Medical Center now Oklahoma State University Medical Center the roux-en-Y gastric bypass surgery. Recently, Dr. Crapse spent time in Dallas, Texas, with former University of Baylor surgical trainer Dr. Nick Nicholson, M.D. learning their “tricks of the trade” for the gastric sleeve procedure. Dr. Crapse has now brought their insight from over 7,000+ gastric sleeve surgeries to help Oklahomans in their fight of obesity.

Bristow Specialty Clinic:  (918) 701-2365

Fax: (918) 367-5272

Family Medicine

Holly Shinnen Gramm, PA-C is a Sapulpa native, and graduate from the University of Arkansas with undergraduate and graduate degrees. After completing the Physician Assistant Program at OU Health Science Center in Oklahoma City, she returned to provide healthcare in the Tulsa Metro area. She moved to Bristow after marrying her husband Gary Gramm. Holly began with Bristow Medical Center in 2013 practicing both Family Practice and Urgent Care.

Holly is Secretary of the Bristow Noon Lions Club, Board Member of the Bristow Education Foundation, volunteers medical coverage at Bristow Pirate Athletic events, and enjoys speaking to and educating Bristow students on a variety of health-related topics. Holly enjoys spending time with her husband (Gary) & children (Graycie and Bo), cheering on the Razorbacks, crafting, and being outdoors.

Bristow Family Practice:  (918) 367-6611

Mary Ann is a PA who grew up in Paden, Oklahoma and was eager to return home to provide quality care to the people she knows and loves. Mary Ann attended The University of Oklahoma and received her Bachelors in Science Education in 2005. She then went on to receive her Masters at OUHSC PA program in OKC in 2007. Mary Ann returned home to provide care to her hometown area in 2008. Mary Ann initially worked for 12 years at the local hospital and clinic where she worked full time covering the ER. Mary Ann also has 9 years of wound care experience. Mary Ann now works at Prague Healthcare Center and is accepting new patients.

At the presentation for the Oklahoma Rural PA of the Year Award, Mary Ann was recognized for her dedication to her patients, her continued perseverance through adversity, and her thoroughness in patient care. Our community is lucky to have Mary Ann as a provider.

To schedule an appointment with Mary Ann, please call (405) 566-3411.


Dr. Hani Malati is an ENT-otolaryngologist in Okmulgee, Oklahoma and is affiliated with multiple hospitals in the area, including Community Hospital and Tulsa Spine and Specialty Hospital. He received his medical degree from Ain Shams University Faculty of Medicine and has been in practice for 42 years. Dr. Malati accepts several types of health insurance, listed below. He is one of 3 doctors at Community Hospital and one of 15 at Tulsa Spine and Specialty Hospital who specialize in Otolaryngology. He also speaks multiple languages, including French.

Dr. Malati now has a clinic at Bristow Medical Center. Contact his staff by using the information below.

Bristow Specialty Clinic:  (918) 701-2365

Fax: (918) 367-5272

Office Fax: (918) 367-4481



3029 W. Main Street
Jenks, OK 74037


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