Meet The Team

Our team has the experience and knowledge needed to provide you with the best possible care from start to finish.

Our Team

founder of the team

Clay Hall
PhD, MBA, NP-C

Clay is an Arizona native, born and raised in Tucson where he attended the University of Arizona. 

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College athletics brought him north to Grand Canyon University and he has been a valley resident ever since. He began his healthcare career 13 years ago working as a paramedic in Scottsdale, which was soon followed by his RN and Nurse Practitioner licensure. His specialties include: family medicine, community health, emergency medicine, and pain management/orthopedics.

While not working, Clay enjoys spending time with his wife Jayme and three young children, Olivia, 6, Jack, 4, and Charlotte, 2. His hobbies include fitness, sports, traveling Arizona, mountain biking, and involvement in his local church.

Jennifer Billingsley
DNP, FNP-BC, CNE

Jennifer is a doctoral-prepared Family Nurse Practitioner who has been working in primary care and geriatrics for over 12 years. 

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Dr. Billingsley obtained her Bachelor’s degree in Science of Nursing from Arizona State University in 2001. After several years employed as Director of Critical Care and Nurse Education Specialist, she obtained her Master’s degree in Nursing as a Family Nurse Practitioner from Grand Canyon University in 2007. Jennifer completed her doctoral work for her Doctor of Nursing Practice degree on “Multi-Faceted Education to Reduce Potentially Inappropriate Medications” in 2016 and was selected as a Distinguished Faculty Scholar in the College of Nursing and Health Care Professions at Grand Canyon University. Currently Dean and Professor at United States University, based in San Diego, California, where she is empowering Family Nurse Practitioner students to reach their dreams of becoming the next generation of clinical providers. She is dedicated to partnering with her patients to determine the best plan of care and decreasing incidents of hospitalization.

Her hobbies include hiking, running, and biking in the beautiful Arizona landscape.

medical director of the team

Dr. Paul Gilbert
MD

Dr. Gilbert received his emergency medicine training from University of Illinois at Chicago and has practiced as an ABEM Board certified Emergency Medicine Physician for 20 years.

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During that time Dr. Gilbert received additional training in long term care, restorative care and anti-aging medicine. He was a Medical Director at Hospice Compassus for 2 years.

Dr. Gilbert owned and operated a physician group for 4 years. This physician group contracted with Banner Payson Medical Center. He was the EMS coordinator for northern Gila county for 8 years. He was an air ambulance medical director for Native Air, Air Methods. He was a laboratory director at a free standing emergency department for Dignity Health. He was also the Regional Medical Director for Dignity Health Arizona General Hospital, where he supervised 8 emergency departments. Dr. Gilbert started to focus on home care and mobile physician therapy in 2019. “It is now my goal to keep patient healthy at home so they don’t need to go the emergency room. When I see patients in the emergency room, often times, it is too late. I want to be part of patients care before it becomes an emergency.”

Dr. Gilbert was the first physician to be hired by Team Select Mobile Physicians and is currently the Medical Director.

Jennifer Wesley
MSN, RN, ACNPC-AG, CWS

Jenni has extensive and diverse experience in wound care, gerontology, pain management, emergency medicine, chronically ill patients, critical care transport, home health, quality improvement, education, and leadership.

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She is a Kansas City native that moved to the Phoenix Valley in 2008 for a better climate for her chronically ill daughter. She is a mother of 7 adult girls with 6 grandchildren and married to a retired Airforce Veteran.

She received her Bachelor of Science in Nursing obtained in Kansas City, Missouri at Rockhurst University in collaboration with Research College of Nursing in May of 2004. She then obtained a Master of Science in Nursing with an emphasis in Adult-Gerontology in Acute Care Nurse Practitioner from Walden University in February of 2019. Additionally, she is a Certified Wound Specialist obtained from the American Board of Wound Management in 2015.

While not working, Jenni enjoys spending her free time with her family, hiking, snorkeling, crocheting, traveling, participating in medical mission trips, and volunteering in outreach events at her local church.

Kristalle Payano
PA-C

Kristalle was born in the Philippines and grew up in NY/NJ. She received her Bachelor of Science in Biology and her Master of Science in Physician Assistant studies from Seton Hall University in South Orange, NJ.

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Since graduating in 2011, she has been working in the field of dermatology and has treated all ages and skin types, focusing primarily on geriatric care since 2019. She is passionate about skin cancer prevention and education. Outside of work, she enjoys traveling, cooking, hiking, and spending time with her husband and toddler

Courtney Zimmerman
MSN, FNP-C

Courtney is from the East Coast and completed her Bachelor of Science in Nursing degree at the University of North Carolina Wilmington. Courtney’s nursing background started in many different specialties but focused primarily on cardiac patients.

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She graduated with distinction with her Master of Science in Nurse Practitioner from the University of Phoenix. Prior to joining Team Select Mobile Physician Services, she started her Family Nurse Practitioner career with Honor Health Neurology, caring for patients with various neurological conditions. Courtney has a passion for helping others and provides compassionate personalized care to all her patients.

Courtney resides in the East Valley with her husband, daughter, and golden doodle. When not working, she enjoys spending time with family and friends, being active, and exploring the great outdoors.

dermatologist of the team

John Stathakis
DO

John is board certified in dermatology and has over 58 years of experience in the medical field. He graduated from Philadelphia College of Osteopathic Medicine medical school in 1963.

team physician assistant

Aneesha Sullivan
MPAS, PA-C

Aneesha is a Board-Certified Physician Assistant that attended graduate school at the Touro University Nevada College of Osteopathic Medicine where she graduated Summa Cum Laude.

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Aneesha completed her training in 2007 and began practicing as a Dermatology and Family Practice Physician Assistant in Charlotte, NC prior to moving to Arizona where she currently practices Dermatology.
team gerontology nurse practitioner

Erin Tomanek
MSN, FNP

Erin is a certified Adult Gerontology Nurse Practitioner with Team Select. She has been in the medical field for over 15 years having worked in Texas and Arizona.

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Academia has been a large part of her life as she has obtained two Bachelor’s degrees, one in Education and one in Nursing, along with a Master’s in Nursing. Erin is a board-certified Adult Gerontology Primary Care Nurse Practitioner through the American Academy of Nurse Practitioners. She now resides in greater Phoenix area with her husband and two sons. She loves being outdoors hiking and biking and visiting her family in California when able. Her goal is to bridge the gap between health illiteracy and personal care management. She works well with her patients, carefully building a cheerful report while providing quality care and education tailored to the specific needs of the patients.

Nicole Barth
MSN, FNP

Heather Killam
MSN, FNP

Mehran Darzy
FNP-C