Our Team of Expert Professionals
Marguerite Critelli, MD
Dr. Marguerite Critelli is a board-certified dermatologist with over 25 years of experience. She earned her M.D. from the University of Colorado and completed her Dermatology residency at UC Irvine, where she developed exceptional surgical skills further refined through her work at the Long Beach VA. Notably, her experience treating World War II veterans who served in the South Pacific provided invaluable insights into complex dermatological conditions.​ A pioneer in cosmetic dermatology, Dr. Critelli was among the first to master Botox, fillers, lasers, and sclerotherapy, blending artistry with science to meet individual patient needs. She excels in lip enhancement and utilizes Sculptra for natural facial and body rejuvenation.​
Karilyn Haut, PA-C
Karilyn Haut, PA-C, is a board-certified Physician Assistant specializing in medical, surgical, and cosmetic dermatology. Certified by the National Commission on Certification of Physician Assistants (NCCPA), Karilyn brings over 17 years of clinical expertise to Dermatology Spa Med. She holds active professional memberships with the Society of Dermatology Physician Assistants (SDPA) and the American Academy of Physician Assistants (AAPA). Karilyn blends an artistic eye with cutting-edge medical training to deliver comprehensive, highly personalized skincare solutions. Her clinical focus ranges from managing complex skin conditions and performing skin cancer screenings to executing advanced cosmetic rejuvenation treatments. Known for her warm energy and patient-centered approach, she excels at putting individuals at ease while developing tailored care plans. Karilyn remains deeply committed to providing compassionate, life-saving care to the Central Coast community.
Howard Kurshenbaum, MD
Dr. Howard Kurshenbaum is a compassionate, board-certified dermatologist with nearly 35 years of experience. He's known for his patience and kindness, prioritizing each patient's comfort and well-being. Dr. Kurshenbaum earned his medical degree from the Medical College of Wisconsin and completed his dermatology residency at the University of Wisconsin. After a brief period practicing internal medicine, he found his true passion in dermatology. For many years, he served the San Diego community as a staff dermatologist at Kaiser Permanente. Originally from Chicago, Dr. Kurshenbaum earned his Bachelor of Science degree from the University of Illinois after attending Northeastern Illinois University. He is board-certified by the American Board of Dermatology and licensed by the California Medical Board. Dr. Kurshenbaum is dedicated to providing exceptional dermatological care.
Alex Liaw, PA-C
Alex Liaw is a compassionate and dedicated Physician Assistant specializing in medical and surgical dermatology. He holds both a Doctorate of Medical Science and a Master of Medical Science from George Fox University. Alex completed his undergraduate studies locally at California Polytechnic State University, San Luis Obispo, where he earned a Bachelor of Arts with a minor in Art & Design. This unique background allows him to approach dermatology with both clinical expertise and a keen aesthetic eye. Alex provides comprehensive care for a wide range of acute and chronic skin conditions, including the diagnosis and management of skin cancer. He performs in-office surgical procedures with precision, prioritizing patient comfort and clear education to ensure the best possible outcomes. Deeply rooted in the Central Coast community, Alex has spent years volunteering with local organizations such as YoungLife and Front Porch SLO. He currently resides in San Luis Obispo and enjoys utilizing his creative talents in digital design.
Delise McEwen, FNP-C
Delise McEwen is a Family Nurse Practitioner specializing in aesthetics at DermaSpaMed. With ten years of experience in healthcare, Delise's journey began as a medical assistant, progressing to a Registered Nurse before becoming an FNP. She earned her Bachelor of Science in Nursing from California State University, Monterey Bay, and is currently completing her Master of Science in Nursing at the University of South Alabama. Delise brings a broad range of clinical expertise to her practice, with experience in both the emergency department and family medicine. Her passion for skincare and dermatology allows her to provide personalized aesthetic treatments while prioritizing patient care. A proud mom of three, Delise enjoys spending her free time with family and exploring her hometown of Arroyo Grande.
Sheryl Miles, PA-C
Sheryl Miles is a board-certified Physician Assistant with a medical degree from the prestigious University of Florida, College of Medicine, School of PA Studies. With a solid foundation in general medicine, Sheryl has cultivated extensive expertise in general, surgical, and aesthetic dermatology, making her a trusted provider for a wide range of dermatologic needs. Currently practicing in the vibrant communities of historic Pasadena, CA, and the picturesque Central Coast, Sheryl is dedicated to delivering exceptional care with a personal touch. When she’s not in the clinic, Sheryl enjoys immersing herself in music, exploring the great outdoors, or cherishing precious moments with her delightful baby boy.
Dan Perry, PA-C
Daniel Perry, MPAS, PA-C, is a dedicated, board-certified Dermatology Physician Assistant specializing in the diagnosis and treatment of a wide range of medical skin conditions. Dan earned both his Bachelor of Science and his Master of Physician Assistant Studies from the University of Nebraska Medical Center.
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With deep roots practicing on the Central Coast, his diverse clinical background includes serving as a Physician Assistant with the California Army National Guard and working as a Vein Specialist in Interventional Radiology, where he performed advanced intravascular procedures for venous disease. Having previously spent over three years providing exceptional care directly within the Dermatology Spa Med team, Dan brings a familiar, patient-centered approach and trusted clinical expertise back to our community.
Khaled Tawansy, MD
Dr. Khaled Tawansy is a highly skilled ophthalmologist and oculoplastic surgeon dedicated to providing exceptional patient care. His journey to becoming a leading physician began with his undergraduate studies at Johns Hopkins University, followed by his medical degree from the University of Michigan Medical School. He then pursued extensive training, including residencies at Henry Ford Hospital and the University of California, Irvine Medical Center. Dr. Tawansy's commitment to excellence led him to further his expertise at prestigious institutions such as Harvard Medical School, the Massachusetts Eye and Ear Infirmary, Vanderbilt University Hospital, and the University of British Columbia Faculty of Medicine, among others. He is board-certified in both Ophthalmology and Oculoplastics, reflecting his specialized knowledge and skills. Dr. Tawansy is passionate about helping patients achieve optimal eye health and specializes in treating a wide range of conditions, including cataracts, retinal detachment, and glaucoma. In addition to English, he also speaks Arabic, allowing him to connect with a broader patient community.
Joanni Vargas, MA
Joanni Vargas is a medical assistant and also the office manager for both the Pismo Beach and Santa Maria offices. She coordinates the entire staff's scheduling and activities, helping to make the appointments with patients run smoothly.
