Our Team
Ashley Underwood, FNP – Nurse Practitioner
Ashley Underwood, MSN, FNP-BC has been a board-certified Family Nurse Practitioner for over 14 years and is a cornerstone of the Cool Renewal team. She leads many of our clinical services, specializing in aesthetic injectables, advanced laser treatments, medical weight loss, and our Precision Longevity Program.
Ashley earned her Master’s Degree from West Virginia University in 2012 and has called the Carolinas home ever since. Her diverse clinical background includes cardiology, primary care, and retail health, providing her with a comprehensive understanding of both wellness and disease prevention. Since transitioning into aesthetics in 2021, she has combined her passion for helping patients look their best with a deeper focus on optimizing health from the inside out.
Ashley believes that true confidence comes from feeling as good as you look. Whether she is creating personalized treatment plans, guiding patients through body transformation journeys, or helping individuals take a proactive approach to longevity and healthy aging, her goal remains the same—to empower every patient to live healthier, feel stronger, and age gracefully.
Known for her compassionate approach and attention to detail, Ashley is dedicated to delivering natural, beautiful results while building lasting relationships with her patients.
Holly Phifer, ME- Medical Esthetician
Holly Phifer serves as a Senior Body Contouring Specialist in our South Charlotte location. Holly joined Cool Renewal Med Spa from a large dermatology practice here in Charlotte. Her clinical experience is extremely varied. She has performed CoolSculpting here at Cool Renewal Med Spa since 2014 and has performed thousands of treatments. Holly is a Medical Aesthetician, has an Associate of Arts degree and attended the University of North Carolina at Charlotte. She earned her Master’s in CoolSculpting from CoolSculpting University in Reston, VA. Holly is deeply committed to her patients and their quality treatments.
Lauren Howie, ME- Medical Esthetician
Lauren Howie serves as our Lead Esthetician in our South Charlotte location. Lauren is a Charlotte native who is passionate about esthetics and thrives on helping clients achieve exceptional results. She has earned her CoolSculpting degree at CoolSculpting University in Reston, VA and is committed to delivering an incredible and unique experience to each client. Lauren understands the subtle relationship between looking one’s best and feeling one’s best. She loves the industry where she can help others transformation into the best version of themselves. Lauren has a diverse background that was focused on the customer experience and service. She is excited to bring those customer service skills to Cool Renewal Med Spa to make every client encounter a memorable one.
Sandy Crowell, ME- Medical Esthetician
Sandy joined our Cool Renewal team as a Medical Esthetician after graduating from the Academy of Nail Technology and Esthetics. She performs CoolSculpting, CoolTone, Scarlet SRF Microneedling, and Aquafirme facials. She has a passion for all things esthetics and thrives on helping clients look and feel their very best. Sandy’s favorite part of her job is educating her clients. When clients truly understand their procedures, pre-during-post, their outcomes are very rewarding. As a graduate of Cool Sculpting University, and with a degree in Nutrition, she feels confident, and looks forward to leading you through your esthetic and Coolsculpting journey.
Kari Stolzenbach, RN
Kari Stolzenbach serves as Body Contouring Specialist and Nurse in our Lake Norman Center. Kari grew up in the Lake Norman area and graduated Cum Laude from the University of North Carolina at Charlotte with her nursing degree. She earned her Master’s in CoolSculpting from CoolSculpting University in Reston, VA. She has 25 years of nursing experience where she has been focused on patient care and outcomes. She is passionate about esthetics and committed to delivering individualized high quality care to her patients. Kari loves bringing her customer service skills to Cool Renewal Med Spa to deliver excellent results.
Lisa Schloeder, RN
Lisa Schloeder is a Registered Nurse and Body Contouring Specialist at Cool Renewal Med Spa. She relocated to Charlotte over 30 years ago following graduation from St. Mary’s Hospital School of Nursing/Marshall University in Huntington, WV. She has focused her career in direct patient care in the acute and outpatient settings. Lisa earned her Master’s in CoolSculpting from CoolSculpting University in Reston, VA. She is dedicated to offering exceptional care by utilizing her skills and knowledge to provide excellent outcomes for clients seeking results with CoolSculpting and CoolTone.
Yaminy Veil
Yaminy Viel is the warm and welcoming face at our front desk and voice on the phone, making sure every patient’s visit runs smoothly from check-in to checkout. With a strong background in customer service and office coordination, she combines professionalism with genuine care to create a seamless experience for our patients. Fluent in English and Spanish, Yaminy is passionate about clear communication, organization, and helping each patient feel comfortable and supported throughout their journey with us.
Stephanie Klimenko, LPN, M-IV
Stephanie Klimenko, LPN serves as the Manager of Cool Renewal’s South Charlotte and Lake Norman locations, where she plays an integral role in the clinical, operational, and patient experience aspects of the practice. A Licensed Practical Nurse with more than a decade at Cool Renewal, Stephanie has helped shape the growth and success of the organization through her dedication to patient care and commitment to excellence.
Stephanie is nationally recognized for her expertise in body contouring and has performed thousands of CoolSculpting treatments throughout her career, earning a reputation as one of the most experienced CoolSculpting providers in the country. She completed her Master’s in CoolSculpting through CoolSculpting University in Reston, Virginia—an advanced distinction reserved for top-performing providers.
In addition to her extensive experience in body contouring, Stephanie is an aesthetic injector specializing in neurotoxins and HA Fillers and is actively involved in Cool Renewal’s longevity and wellness initiatives. Her background in nursing, aesthetics, and patient management allows her to provide a personalized approach to helping patients achieve their aesthetic and health goals.
Stephanie earned her nursing degree from Fortis College in Ohio and her undergraduate degree from the University of Akron. She maintains nursing licensure in both North Carolina and Ohio and is currently pursuing her Associate Degree in Nursing to further expand her clinical expertise.
Passionate about helping others look and feel their best, Stephanie is known for her compassionate nature, attention to detail, and ability to make every patient feel comfortable and confident throughout their journey. Whether she is overseeing day-to-day operations, performing treatments, or supporting patients through transformative experiences, Stephanie remains committed to delivering exceptional care and results.
Brad Jensen, Director of Operations
Brad Jensen serves as our Director of Operations and business manager. Brad has spent his entire career in consulting and the financial services industries. Brad has BA and an MBA in finance/operations. Brad and his family moved to Charlotte in 2001. For the past 20 years, Brad has been completely focused on operational excellence with the needs of the client/patient at the center of every business process. Brad is committed to make sure Cool Renewal Med Spa operates with the same focus and intensity, with an utmost dedication of taking care of the patient.
Dr. Jason Patten – Medical Director of Cool Renewal Med Spa
Dr. Jason Patten, MD
Medical Director | Co-Developer, Precision Longevity Program | Flight Surgeon
Dr. Jason Patten serves as the Medical Director of Cool Renewal Med Spa and is the co-developer of Cool Renewal’s Precision Longevity Program. Throughout his distinguished career, Dr. Patten has been a recognized leader in Emergency Medicine, Aviation Medicine, Nutrition, Weight Loss Medicine, Hormone Optimization, and Human Performance.
His educational background includes the U.S. Air Force Academy, Auburn University, the University of Alabama at Birmingham School of Medicine, and the University of Utah. Dedicated to service from an early age, Dr. Patten began his career as an EMT and firefighter before joining the United States Air Force to become an F-16 pilot.
In a remarkable chapter of his life, Dr. Patten was deployed to Iraq as an F-16 pilot while attending medical school, where he continued his medical training by conducting trauma research and assisting in military hospitals between combat missions. Today, he proudly continues to serve as a Flight Surgeon in the Air National Guard while practicing Emergency Medicine.
Dr. Patten’s passion has always been understanding and optimizing human performance. Drawing from decades of experience in high-pressure environments—where lives depend on preparation, precision, and peak performance—he has helped shape Cool Renewal’s Precision Longevity Program alongside Dr. Bill Peace.
Inspired by the principles of aviation medicine and military readiness, the program was developed for individuals who want to proactively manage their health, maximize performance, and extend their healthspan. Through advanced diagnostics, genetic testing, cardiovascular imaging, hormone optimization, and personalized wellness strategies, Dr. Patten and the Cool Renewal team help patients identify risks before they become disease.
Dr. Patten believes that the future of medicine lies in prevention, not reaction.
Dr. Bill Peace – Medical Director of Cool Renewal Med Spa
Dr. Bill Peace, MD
Co-Developer, Precision Longevity Program | Orthopedic Surgeon | Physician Leader
Dr. Bill Peace is a board-certified orthopedic surgeon and one of the physician leaders behind Cool Renewal’s Precision Longevity Program. Alongside Dr. Jason Patten, Dr. Peace has helped develop a comprehensive, data-driven approach to health optimization designed for individuals who want to perform at their highest level—for longer.
Drawing on decades of experience in medicine, surgery, and healthcare leadership, Dr. Peace understands that longevity is about more than adding years to life—it’s about preserving strength, mobility, cognition, and independence throughout every stage of life. His career has been dedicated to helping patients stay active, resilient, and capable of doing the things they love.
As a former executive healthcare leader and practicing orthopedic surgeon, Dr. Peace brings a unique perspective to preventative medicine. His expertise in musculoskeletal health, performance, and aging allows him to help patients build personalized plans focused on extending both lifespan and healthspan.
Inspired by the discipline, precision, and performance standards found in aviation medicine, Cool Renewal’s Precision Longevity Program was developed to help patients proactively identify risk factors before disease develops. Utilizing advanced genetic testing, cardiovascular imaging, metabolic analysis, hormone optimization, and whole-body assessments, Dr. Peace and the team help patients take control of their future health.
At Cool Renewal, Dr. Peace is passionate about partnering with patients who refuse to settle for “normal aging.” His mission is simple: help people move better, feel stronger, think clearer, and live longer.