ADCS Clinics is pleased to announce its first class of the ADCS Orlando Dermatology Residency Program. The residents are: Jeff Collins, DO, Nicole Swenson, DO, Amelia Damse, DO, Pam Kittipongdaja, DO and Michael Zaycosky, DO

Dr. Matt Leavitt, Founder and CEO of ADCS, as well as Chairman of the ADCS Orlando Dermatology Resident Program, said “We are very excited about our inaugural class. We had incredible candidates apply and interview. Our faculty and staff are pleased to welcome and wish them well with their training, as we have set the bar high for them.”

Also, as we continue to grow and see more patients, we need to recruit top dermatologists in the country to ensure we maintain our focus of offering world-class patient care. By doing so, we strategically added best in class providers.

“Our careful consideration to add new doctors to certain geographies is based on patients seeking quality dermatological care and increased insurance coverage. We are now in a great position to provide for those patients.” said Dr. Leavitt.

The new providers to ADCS are:

Augusto Montalvo, MD

Dr. Montalvo is a board-certified dermatologist who specializes in adult surgical, general and cosmetic dermatology.

Born in Puerto Rico, Dr. Montalvo was raised in Chicago were he navigated through the public school system. He graduated with a Bachelor’s degree in biology from Pace University in New York, and obtained his medical degree from Boston University School of Medicine. During medical school, Dr. Montalvo also completed a Master’s degree in Public Health from Harvard University.

Dr. Montalvo completed a residency in Internal Medicine at Montefiore Medical Center, serving as Chief Resident during his final year. After completing a US Public Health Service obligation he obtained additional residency training in Dermatology at the University of Illinois at Chicago.

Dr. Montalvo was a Clinical Assistant Professor at the University of Illinois at Chicago before serving as the Clinical Practice Director of the Department of Dermatology at Northwestern University, a position he held for six years. He entered private practice in 2002 while continuing his close affiliation with Northwestern’s Department of Dermatology. During this time he was instrumental in creating the Illinois Dermatology Institute, LLC.

He is a member of several professional organizations including:

  • American Academy of Dermatology
  • American Society of Dermatologic Surgery
  • Chicago Dermatological Society
  • Chicago Medical Society
  • Illinois Medical Society
  • Florida Medical Society

Bill Steffes, MD

Dr. Bill Steffes is a board eligible dermatologist who specializes in medical and surgical dermatology. He has a dedicated interest in the early detection and treatment of skin cancer, as well as the management of many common dermatologic disorders including acne and psoriasis. His priority is helping patients achieve healthy skin and improving their quality of life.

Dr. Steffes was born and raised in Baton Rouge, Louisiana where he attended Catholic High School. He attended college at The University of Texas at Austin where he earned a B.S. in chemical engineering. He then returned to Baton Rouge to work as an engineer for a local environmental services firm. After several years of engineering, Dr. Steffes made the decision to attend medical school and enrolled at Louisiana State University Health Sciences Center in New Orleans. He graduated at the top of his medical school class and earned several academic awards including becoming a junior inductee into the Alpha Omega Alpha medical honor society.

Dr. Steffes and his wife then moved to Gainesville, Florida where he completed an internship in Internal Medicine at the University of Florida. He went on to complete his dermatology residency at UF where he served as Chief Resident.

Dr. Steffes is a member of several professional organizations including:

  • American Academy of Dermatology
  • American Society of Dermatologic Surgery
  • Florida Society of Dermatology and Dermatologic Surgery
  • Alpha Omega Alpha

Charya By, MD

Dr. Charya C. By is a board certified dermatologist, specializing in general, procedural, and cosmetic dermatology. Dr. By graduated from The University of Georgia with a triple major in Genetics, Biology, and Microbiology. She received her medical degree from the Medical College of Georgia. Dr. By, then, went on to complete her Internal Medicine Internship and Dermatology Residency at the University of Florida. She served as Chief Resident in her final year of training and was awarded the UF Resident Educator Award for her excellence in teaching. After completing her residency, Dr. By joined the UF faculty to continue her work in clinical resident education while serving as the department’s cosmetic dermatologist.

Dr. By is a member of the following professional societies:

  • Diplomat, American Board of Dermatology
  • Fellow, American Academy of Dermatology
  • Alpha Omega Alpha Honor Society

Joshua Spanogle, MD
Mohs Surgeon

Dr. Spanogle is a fellowship trained Mohs Surgeon specializing in skin cancer removal and reconstruction. He practiced in the San Francisco Bay Area prior to joining Advanced Dermatology in Jacksonville. Dr. Spanogle received his undergraduate degree from Yale University. He received his medical degree at the Stanford University School of Medicine, where he also completed his internship in Internal Medicine. Following a residency in Dermatology at the Mayo Clinic in Rochester, MN, Dr. Spanogle completed a Fellowship in Mohs Micrographic Surgery at the University of California, Irvine. Dr. Spanogle has published numerous academic papers and other academic writings. He is Board Certified in Dermatology, and is a member of the American College of Mohs Surgeons, the American Society for Dermatologic Surgery, and the American Academy of dermatology.

In addition to being a Dermatologic Surgeon, Dr. Spanogle is the author of two novels, both of which were San Francisco Chronicle and Los Angeles Times bestsellers. Isolation Ward was published in 2006, and Flawless in 2007.

Dr. Brent Taylor, MD
Mohs Surgeon

Dr. Brent Taylor attended Harvard College, where he graduated magna cum laude in three years with a bachelor of arts in biochemical sciences. He attended Vanderbilt School of Medicine on a full, merit-based scholarship and graduated from medical school in 2009. During his residency training at Medical University of South Carolina, he published sentinel research on Mohs surgery laboratory techniques. He then completed an ACGME-accredited fellowship in Mohs surgery and procedural dermatology at Scripps Clinic in La Jolla, California. His fellowship training focused on skin cancer and reconstruction as well as minimally invasive vein treatments including endovenous laser ablation and ultrasound-guided sclerotherapy. He returned to the southeast and has since worked as a Mohs surgeon at University of Florida’s Department of Dermatology.

Panagiotis Mitropoulos, DO

Dr. Mitropoulos is a board certified dermatologist. He earned his medical degree from Kansas City University of Medicine and Biosciences in 2005. He served as chief resident during his dermatology residency at Broward Health / NOVA Southeastern University, in Fort Lauderdale, Florida. Prior to his dermatology training Dr. Mitropoulos served overseas in the Armed Forces as a General Medical Officer. He completed his medical internship at Triple Army Medical Center in Honolulu, Hawaii in 2006. He also earned a Master’s degree in Epidemiology from the University of Arizona in 2001. Dr. Mitropoulos practices general, surgical, and cosmetic dermatology.

Colene Calo, DO

Dr. Colene Calo graduated at the top of her class from Nova Southeastern University, which is now located in Davie, Florida, in 1995. She moved to Michigan to complete her internship and residency at Pontiac Osteopathic Hospital where she served as Chief Resident. Dr. Calo was in private practice for 12 years before being invited to be an associate clinical professor with Michigan State University. She worked at her alma mater for 2 years, serving as the Clinical Director of the dermatology residency. She was responsible for training residents in varying stages of their 3-year program. Dr. Calo is a fellow of the American College of Osteopathic Medicine.

Valenie Rivera-Roig, MD

Dr. Valenie Rivera-Roig is a board-certified dermatologist specializing in the diagnosis and treatment of skin, hair and nail conditions. She also performs cutaneous surgery and cosmetic dermatologic procedures.

Dr. Rivera-Roig obtained her medical degree from The University of Puerto Rico where she graduated with highest honors. During her medical school studies she received multiple awards including The Janet M. Glasgow Memorial Award for graduating first in her class.

She also did her Dermatology training at The University of Puerto Rico. While in residency, she wrote several articles and published in The International Journal of Dermatology. She was elected chief resident during her last year of training.

After graduating and obtaining her board certification, she remained in private practice in her native Ponce, Puerto Rico for 9 years before joining The Advanced Dermatology team.

Michael E. Burton, MD
Plastic Surgeon

Michael Burton is a Plastic Surgeon with an emphasis on cosmetic surgery of the face, breasts, and body. He earned his medical degree at The George Washington University in Washington, D.C. and completed his General Surgery and Plastic Surgery training at the highly sought after Michigan State University program in Grand Rapids, Michigan. There he trained with many leaders in the field of Plastic Surgery including world-renowned breast surgeon, Dr. Dennis Hammond.

Dr. Burton has published papers in various plastic surgery journals including the prestigious Plastic and Reconstructive Surgery Journal. He has also presented his research at both regional and national meetings.

He has participated in multiple volunteer surgical missions with Operation Smile including trips to India and Nicaragua. There he treated children with cleft lip and palate deformities who lacked access to specialized surgical care.

Dr. Burton obtained a degree in Fine Arts, Painting and Drawing. During his training he had a special emphasis in the Human form and took advanced courses figure drawing, painting, and sculpture. This unique training in the visual arts has complemented his surgical expertise in plastic surgery to deliver a highly customized aesthetic result.

John Poser, MD
Plastic Surgeon

Dr. John S. Poser is a 3rd generation physician who is fully trained in general surgery and plastic surgery, being Board Certified in the later. Dr. Poser graduated and was trained in plastic surgery at Boston University in Boston, Massachusetts under a well-known Plastic Surgeon Dr. Gasbar Anastasi; there he received special training, not only in trauma and reconstructive surgery, but also cosmetic surgery.

Dr. Poser has been practicing plastic surgery in Gainesville, Florida since 1984 and holds courtesy privileges at Shands at UF, as well as being on active staff at North Florida Regional hospital.

Dr. Poser is certified by the American Board of Plastic Surgery and is a member of their society, The American Society of Plastic Surgery. He is a member of the International Society of Plastic Surgery and the Southeastern Society of Plastic Surgery, as well as a Fellow of the American College of Surgeons. Dr. Poser belongs to the Florida Medical Society of Alachua County and is the President Tri County Health Alliance.

Dr. Poser’s father and grandfather on both sides were doctors in Wisconsin. Dr. Poser’s paternal grandfather, Dr. Edward Poser founded the Poser Clinic in Columbus, Wisconsin, in 1894, which is the 2nd oldest clinic in the state of Wisconsin. The Poser Clinic is now being run by his cousins, Ralph and Sam Poser.

The Poser Family has a tradition of sports and medicine. Dr. Edward Poser tried out with, Chicago Cubs, which were in their fourth year of professional baseball, while playing on the Rush Medical School Club team in 1891. Dr. Bob Poser played baseball and basketball for the University of Wisconsin and baseball for the Chicago White Sox and St. Louis Browns. He coached the University of Wisconsin Baseball team while in medical school. Dr. Bob Poser’s brother, Rolf Poser, was Captain of the University of Wisconsin Basketball team twice and both are in the University of Wisconsin Sports Hall of Fame.

Dr. John Poser was co-captain of the Wisconsin Baseball team and was voted the best pitcher in the BIG 10 Conference while in pre-med at the University of Wisconsin. He was the only freshman at the University of Wisconsin who played three sports.


  • 1968 – Bachelor of Arts – University of Wisconsin (Madison, WI)
  • 1973 – Medical Degree – Northwestern University (Chicago, IL)
  • 1973-1974 – Internship(Rotating) – Santa Barbara College Hospital (Santa Barbara, CA)
  • 1974-1976 – General Surgery Residency – Santa Barbara College Hospital (Santa Barbara, CA)
  • 1977-1979 – General Surgery Residency – St. John’s Hospital (Gross Point, MI)
  • 1980-1982 – Plastic Surgery Residency – Boston University (Boston, MA)
  • Practice
  • 1983-1984 – Poser Clinic (Columbus, WI)
  • 1984-current – Poser Plastic Surgery Center (Gainesville, FL)

Staff Appointments

  • North Florida Regional Medical Center (Gainesville, FL)
  • Villages Endoscopy & Surgical Center (The Villages, FL)
  • Alachua General Hospital (AGH)- 25 years of service (Gainesville, FL)
  • Past Chief of Surgery at Shands at Alachua General Hospital (Gainesville, FL)


  • Certified American Board of Plastic Surgery

Professional Organizations

  • Florida Medical Association
  • American Medical Association
  • Fellow of American College of Surgeons
  • Member, International Society of Plastic Surgeons
  • American Society of Plastic and Reconstructive Surgeons
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