Spectrum Dermatology is home to top notch medical professionals with a variety of expertise and training in the field of dermatology. Get to know a few of our team of board certified dermatologists, nurse injectors, physician assistants, and nurse practitioners.
Board certified in Dermatology and fellowship-trained in Mohs skin cancer surgery, Dr. Nancy Kim is a former Assistant Professor of Dermatology at the University of Arizona. Dr. Kim has authored extensively on various topics in the field of dermatology and her work has been published in peer-reviewed journals. Dr. Kim is recognized by Phoenix Magazine as a Top Doc in 2017, 2018 and 2019.
Dr. Catherine Chen is a board certified dermatologist with over 10 years of experience in the East Valley. She joins Spectrum Dermatology with her primary goal of constructing the best skin care and multi-disciplinary team for her patients.
Dr. Geoghegan is proud and excited to join the staff of Spectrum Dermatology where she is able to use her skill and expertise in breast, body, and reconstructive procedures to help patients achieve beautiful and natural-looking results. Dr. Geoghegan is also voted Best Of The Valley for “Best Female Board Certified Plastic Surgeon” in 2019 by Arizona Foothills Magazine.
Dr. Brooke Grant Jeffy is a board certified dermatologist, practicing in the Phoenix area since 2012. Dr. Jeffy is board certified by the American Board of Dermatology and a fellow of the American Academy of Dermatology.
Dr. Layton completed medical school at Stanford University School of Medicine where she engaged in clinical research at the Stanford Cancer Center related to melanoma skin cancer. Dr. Layton completed her Dermatology Residency at Tufts Medical Center in Boston, MA.
Dr. William McLeish hails from Chicago and joined Spectrum Dermatology after establishing a revered practice for 30+ years. His background includes work with the Mayo Clinic for over 20 years, where he served both the departments of Ophthalmology and Plastic Surgery. Dr. McLeish also served as the head of Scottsdale Healthcare during his illustrious career and has trained over 100 residents and fellows.
Dr. O’Neill is dual board-certified by both the American Board of Dermatology and the American Board of Pathology. He has completed extensive formal training in the histologic interpretation of skin biopsies, and works on-site at Spectrum Dermatology. This allows for accurate and timely clinicopathologic correlation and turnaround time for Spectrum’s patients.
Dr. Jennifer Peterson spent two years practicing medicine in her Las Vegas hometown before joining the Spectrum Dermatology team. She is skilled in both general medical and cosmetic dermatology and excels in treating a wide range of dermatological conditions.
Dr. Michael Probstfeld is board-certified by the American Board of Surgery and an American College of Surgeons Fellow. Formerly the governor of the Arizona chapter of the American College of Surgeons and former Chief of Staff at the Tucson Medical Center (2012 – 2014), Dr. Probstfeld has an illustrious, impressive background in providing the best in surgical care to his patients.
Randi Rubenzik, MD, is a board certified dermatologist who brings more than 12 years of expertise to Spectrum Dermatology. She sees patients with a variety of medical problems ranging from pediatric to adult dermatology. Dr. Rubenzik is recognized by Phoenix Magazine as a Top Doc in 2017.
Dr. Ross Stutman is board certified by the American Board of Plastic Surgery. He specializes in cosmetic, oculoplastic (reconstructive and cosmetic surgery of the eyes), and general reconstructive plastic surgery.
Dr. Thosani completed her internship at New York University’s Downtown Hospital in Manhattan. She then completed three years of residency and served as a Chief Resident in Dermatology at Stony Brook University Hospital and spent a significant amount of time at the Veterans Affairs hospital and at Memorial Sloan-Kettering Skin Cancer Center. Dr. Thosani is recognized by Phoenix Magazine as a Top Doc in 2017, 2018, and 2019.
Dr. Wald is a board-certified dermatologist, Mohs micrographic surgeon, and fellow of the American Academy of Dermatology. Dr. Wald’s residency training included a focus on skin cancer detection and treatment, as well as laser therapies, and performed over 1,700 surgeries and reconstructions.
Dr. Rajan Bhatt is double board certified in Cardiology and Internal Medicine. With his extensive training, Dr. Bhatt is committed to providing the highest quality of care to his patients, utilizing the most recent medical and surgical advances in a warm and compassionate environment.
Laura Allen is a board certified adult nurse practitioner and has been practicing medical and cosmetic dermatology in the Phoenix Valley since 2006. Laura is well versed in performing full body skin exams for the prevention and detection of skin cancer in adolescents, adults, and seniors.
Holly Nichols is a board certified nurse practitioner who has worked in dermatology for over 10 years. Prior to settling in Arizona, Holly specialized in patients with acne, rashes and warts and sees many patients for skin cancer screenings.
Maggie is a board certified Physician Assistant, PA-C who has been practicing general and cosmetic dermatology in the East Valley since 2001. Maggie has 14 years of extensive clinical experience in general, ethnic, and surgical dermatology seeing a full spectrum of dermatologic conditions of the skin, hair and nails.
Katherine is a board certified nurse practitioner with a specialty in dermatology. With over 35 years in the medical field she brings the knowledge and experience to offer quality individualized care to each of her patients.
Darren West is a nationally board-certified physician assistant with over 18 years of experience in clinical dermatology. He brings extensive experience in adult dermatology, pediatric dermatology, and dermatologic surgery.
Priscila brings over 25 years of extensive training and expertise in the field of Aesthetic Modalities and Skin Care as the Licensed Nurse Injector at Spectrum Dermatology.
Terri brings over nine years of expertise as a Registered Nurse to Spectrum Dermatology where she performs advanced dermal filler injections and laser procedures utilizing many of the latest technologies available in aesthetic medicine today.
"I would follow Dr. Catherine Chen-Tsai to the moon. Best dermatologist I have encountered. She is thorough, patient-focused, and passionate about her profession. I have followed her to her current practice as she has treated me for ten years."
"The doctor was extremely kind and told me I was misdiagnosed by another doctor!!! I was put on the right treatment for my skin condition and there are already major results 24 hours later. So thankful for spectrum and their doctors, getting closer to having normal skin again!"
"Dr. Kim is the best! Very prompt and professional. Explains the options and what to expect from the treatment she recommends."
"We did not wait longer than ten minutes from the time we checked in with the front desk. Our wait time in the exam room was less than five. Pretty impressive for the later part of the day! We will happily return to Spectrum Dermatology for any future skin issues!"
"The office was spotlessly clean, the waiting area was very nice, the staff was very friendly and helpful, the doctor was professional and knowledgeable. I was given time to ask questions and received easy to understand answers. I will be back!"
"I have been a patient for over a year and would recommend anyone looking for a dermatologist to contact Spectrum Dermatology and ask to meet with Dr. Jeffy."
"I was in today for an appt. with Dr. Thosani, who is a wonderful Doctor. I am 72 and I don't get impressed very easily. She is always very professional and gentle."
"Everyone at the Tatum location has been awesome to work with. They explain the risks, the process, and make it as painless as possible."
"I have taken my wife to Dr. Kim for a few of her appointments. She is without a doubt the best at what she does. Excellent bedside manner, very professional and yet, so down to earth to make you feel at ease."
"My many questions were answered thoroughly and I was not made to feel rushed. I felt very comfortable during the exam due to Dr. Jeffy's demeanor. I highly recommend Spectrum Dermatology."