Our Staff

Medical Director

Ann Nolen, D.O., attended medical school at the University of North Texas Health Science Center. She is board-certified in both family practice and anti-aging medicine. Though she has always practiced family medicine, her interest in anti-aging and medical aesthetics has become a passion. She is trained in Botox and Dermal Filler injection techniques and has over eight years of injectable experience. Today, as the Medical Director of Calista Skin and Laser Center Dr. Nolen enjoys helping people regain their youthful appearances through the advanced anti-aging and aesthetic procedures.

Nurse Practitioner

Lisa L. Ferguson, DNP, RN, WHNP-BC, received a Master of Science in Nursing, Women’s Health Nurse Practitioner from Texas Woman’s University in 2002, and a Doctor of Nursing Practice from Texas Woman’s University in 2013. In 2011, Lisa retired after 20 years of honorable active service in the United States Air Force where she attained the rank of Major. She is adjunct faculty in the Graduate College of Texas Woman’s University and works part-time in Parkland Hospital’s women’s emergency room. At Calista she’ll consult with patients interested in hormone replacement therapy and she’ll implant the bio-identical hormone pellets. We are proud to have Lisa a member of the Calista Skin and Laser Team.

Professional Laser Technician

Laura Whitley, M.A., is a state certified Professional Laser Technician which is the highest certification in the state of Texas. She has received advanced laser training from Syneron and Candela on the most advanced laser procedures available today. She has over 15 years’ experience as a laser technician and has an incredible amount of experience in virtually every aspect of aesthetics and her passion is helping people achieve their aesthetic goals. Since Laura has spent most of her career in the Colleyville area our clients are so pleased when they find that Laura is here at Calista.

Medical Assistant / Laser Technician

JoAnn Brawner, M.A., is a state Certified Laser Technician receiving her laser training from Texas Laser Institute and has received additional training by Syneron and Candela on their laser systems. Since she is a medical assistant she also performs various wellness procedures including the lab tests for our patients seeking bio-identical hormone pellet replacement. JoAnn enjoys working with people and finds it very rewarding to help them accomplish their cosmetic and wellness goals.

Owner / General Manager

Dan Schildgen graduated with a Bachelor of Science degree in biology from The University of South Florida. He retired after a career in pharmaceuticals and several years ago made the decision to go into aesthetics and opened Calista Skin & Laser Center. His greatest satisfaction is “helping people feel more confident about their appearance, ultimately seeing them become happier and more outgoing. As a result, they lead more active and healthier lifestyles.”

Wellness Consultant

Libby Harbin has been a Colleyville resident for eighteen years. Although her Master’s Degree is in Education, Libby has always been involved in fitness and nutrition. Teaching aerobics has kept her busy throughout her life as well as consulting about weight loss. Health and wellness have been important in Libby’s training. Consequently, the natural next step was for her to receive advanced training in hormone replacement therapy and anti-aging procedures. Libby is a real people person and is interested in helping everyone live their best life!


Lisa Stewart is a graduate of the University of Texas. She is married to Mike Stewart and has two children. After numerous career relocations around the U.S. and Australia her husband’s career finally brought them to Colleyville. Lisa loves living in Colleyville and after years of being a stay-at-home mom has enjoyed going back to work. She is a natural in this business and truly understands aesthetics. You will appreciate Lisa’s knowledge and her ability to help you select the procedure that’s right for you…you’ll never feel pressured.

Call and make your appointment today 817-203-4925