Leadership Team

Grant Asay

Grant Asay

Chief Executive Officer

Grant Asay is the CEO of Xpress Wellness and Integrity Urgent Care. Grant earned his Masters in Health Administration from the University of Washington and his Bachelors of Laboratory Science at the University of Utah. He has more than 35 years of experience in executive leadership positions including General Manager at Fresenius Medical Care and Executive Vice President at LifeCare Management Services. He has also served on several national healthcare boards and commissions. Grant is passionate about rural health care. He served as a hospital CEO in Alaska, rural Nevada and Montana. He channels this passion for rural health care into his current position of growing medical care services in Oklahoma, Kansas and Texas.

Steven Hull

Steven Hull

Chief Operating Officer

Steven is a Texas native and started his urgent care career as a radiologic technologist in Waco, TX in 2009.  He developed a deep passion for the urgent care industry and obtained his bachelor’s in business administration from Tarleton University in 2014 and his MBA from Tarleton University in 2021.  He was able to work with many great leaders in the urgent care industry through his various roles from 2009 to 2017, when he became the co-owner and the chief operations officer for Integrity Urgent Care in Texas.  After the acquisition of Integrity Urgent Care by Xpress Wellness Urgent Care in 2022, Steven became the chief operations officer for both brands.

Steven and his amazing wife have four wonderful children and in his downtime he enjoys photography, mountain biking, and playing games with his family.

Tony Hill

Tony Hill, DO

Chief Medical Officer

Dr. Tony Hill is a rural Oklahoma native.  He graduated from Oklahoma State University then went on to earn his DO from OSU College of Osteopathic Medicine in Tulsa, OK. He then completed an Emergency Medicine Residency at Tulsa Regional Medical Center and practiced Emergency Medicine for almost 10 years. During this time, Dr. Hill became involved in the practice of Urgent Care Medicine, in addition to his ER practice. In 2010, Dr. Hill transitioned his practice to full-time Urgent Care and has never looked back.

While working in urgent care Dr Hill developed a special interest in Worker’s Compensation and Employer Services, and was the Director of Occupational Medicine for MedNOW Urgent Care for 15 years. He is now performing the same role for the Xpress Wellness and Integrity Urgent Care system. He enjoys training providers in the intricacies of treating work-related injuries, with a focus on getting the injured worker back to pre-injury functioning as quickly as possible. Dr. Hill enjoys engaging with Work Comp insurance adjusters and company representatives when they have questions on patient care.

Dr. Hill lives in Northeastern Oklahoma with his wife and 6 children and enjoys watching all of his kids play their multiple sports.


Petrina Harris, CPA

Chief Financial Officer

Petrina brings over 19 years of experience in the healthcare and medical industry, including more than seven years of audit experience with a top 10 national CPA and consulting firm.  Before joining Xpress Wellness, she was the CFO of a hospital management company and served as the CFO for two of their managed hospitals in Kansas. Petrina graduated in 2002 with distinction from the University of Oklahoma with a Bachelor of Business Administration in accounting and management information systems (MIS).  She is also a Certified Public Accountant. Petrina and her husband have three beautiful children, Olivia, Collin, and Christian.

Dr. Eddy Dark

Eddy Dark, DO

Chief Development Officer

Dr. Eddy Dark is a Floridian by birth but got to Texas as soon as he could. He attended Baylor University, where he met and later married his beautiful wife, Amy. He attended the University of North Texas for medical school and Scott and White Hospital for residency in Emergency Medicine where he became board certified. He worked as an ER physician for 8 years before deciding to open his first urgent care in Waco. In the ER he experienced the crippled healthcare system that this country is living through. He saw urgent care as a common-sense answer to many of the healthcare problems and drama. “Why can’t we go back to treating patients how we would want to be treated?” is the driving question to our urgent care clinics. He has partnered with several great medical providers that share this passion for common sense medicine that is served with value and enveloped in integrity.

Dr. Dark lives on a farm in central Texas with his wife of 19 years and his three awesome children. He is passionate about Faith, Family, and Farming. The Darks are active members of Fellowship Bible Church where they love investing in men’s and women’s lives, as well as marriage and family groups. Dr. Dark loves teaching his children the business side of farming and is really proud of their micro-businesses of raising chickens, goats, pigs, and cattle.

Tamala Grabeal

Tamara Grabeal, MSN, APRN-CNP

Executive Director of Advanced Practice Providers

Tamara Grabeal, MSN, APRN-CNP is a Family Nurse Practitioner who has worked with Xpress Wellness Urgent Care since its inception in 2014. A 1994 graduate of Southwestern Oklahoma State University, she worked as an ER/ICU nurse and home health case manager prior to returning to school. She graduated from Graceland University in 2003 with a masters of science in nursing, family nurse practitioner track. As a nurse practitioner, she practiced in primary care and cardiology before beginning her employment with Xpress Wellness Urgent Care. Tamara enjoys hiking, fishing, and playing with her corgis in her spare time.


McKensey ElKouri

Director of Provider Relations & Recruitment


Kerstin Olson

Director of Business & Strategic Operations


Kendra Pride

Director of Revenue Cycle

Dr. Moore

Dr. Joe Moore

Medical Director, Post Acute Services

Dr. Moore joined Xpress Wellness as the Director of Community and Facility Medicine in 2023. His career has transitioned from intensive inpatient hospital work to growing a successful primary care clinic to now working within the nursing home setting exclusively. He enjoys applying in depth internal medicine principles with a focus on providing compassionate, comprehensive care to patients within the long term and rehab settings. He strives to provide the highest level of care to minimize complications and returns to the hospital while providing clear communication with the patient’s family and specialists involved in care. A family man with three teenagers, Dr. Moore and his family have lived in Tulsa since 2007.

Jeff Martindale

Jeffrey W. Martindale, Ph.D.

Behavioral and Psychiatry Program Director

After serving in the United States Navy, Dr. Martindale pursued training in psychology and earned his Ph.D. In Counseling Psychology at Texas Tech University. Since that time, he has provided clinical care to college students at the University of Arkansas and Langston University in clinical and management roles.

While serving for the Veterans Affairs, he cared for aging Veterans within primary care medicine and hospice. Dr.Martindale has also served the aging in long-term care and skilled settings providing direct
patient care and clinical oversight and management of operations across multiple states.

Dr. Martindale currently serves with a mission to expand behavioral health services in rural areas for Xpress Wellness and Integrity Urgent Care. With a leadership style that motivates others to accomplish their best, he aims to make Xpress Wellness and Integrity Urgent Care a model for delivering the best of experienced, integrated and compassionate care to rural America.

Dr. Martindale lives in Stillwater, OK with his family to include wife and two daughters. He enjoys cycling and playing the Native American flutes and Shakuhachi. He has also been trained by Remo Drums as a Health Rhythms facilitator for therapeutic drum groups.

Samantha Roberts

Director of Human Resources

Samantha was born and raised in New York. She moved to Alabama where she obtained her Bachelor’s in Elementary and Special Education from The University of Alabama in 2013 and her Master’s in Human Resource Management from Troy University in 2015. She met her husband while in Alabama and started her HR career in the trucking and transportation industry in 2015, before her husband’s military career relocated them to Texas, Virginia, and finally Oklahoma. During this time, she obtained her Professional in Human Resources (PHR) and SHRM Senior Certified Professional (SHRM-SCP) designations. She fell in love with healthcare Human Resources while living in Virginia and is passionate about providing support to healthcare professionals so they can focus on delivering high quality healthcare to those in need.

Sam currently lives in rural Southwest Oklahoma with her husband, two amazing children, and 2 dogs (and a stray barn cat that her husband can’t know about). In her free time, she loves watching sports – mainly college football and NHL, spending time with her family, and traveling to new places.