Lee C. Ferguson, D.O. | Michael B. Hogan, M.D. | Ralph B. Pfeiffer, Jr., M.D. | Nicholas S. Clapper, D.O.

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Lee C. Ferguson, D.O., R.P.V.I.

Dr. Ferguson is board certified in vascular and general surgery. He graduated from Pikeville College of Osteopathic Medicine in 2008. He completed his surgical residency at The University of South Alabama Medical Center in 2014 followed by his vascular surgery fellowship at The University of Mississippi Medical Center in Jackson, Mississippi in 2016.

Dr. Ferguson is skilled in advanced, minimally invasive, endovascular techniques as well as traditional open surgery for the treatment of peripheral arterial disease (PAD), limb salvage, aortic aneurysmal and occlusive disease, carotid disease, varicose veins, lower extremity swelling and deep vein thrombosis and pulmonary emboli. 

Medical Licensure:

  • Alabama – 2011 to present
  • Mississippi – 2014 to present


  • 2015 - Board Certified, American Board of Surgery in General Surgery
  • 2017 – Registered Physician in Vascular Interpretation (RPVI)
  • 2021 - Board Certified, American Board of Surgery in Vascular Surgery
  • Advanced Cardiac Life Support Certification
  • Basic Life Support Certification

Professional Memberships:

  • Outpatient Endovascular Interventional Society since 2021
  • Society of Vascular Surgery, member since 2014
  • Southern Association of Vascular Surgery, candidate member since 2016
  • American College of Surgeons, member since 2008
  • Medical Society of Mobile County, member since 2008

Honors and Achievements:

  • Earnest G. DeBakey Surgical Summit – Presenter, Mobile Infirmary Medical Center, Mobile AL – August 2017
  • Foundations of Lower Extremity Amputee Care – Presenter, Rotary Rehabilitation Hospital, Mobile, AL – June 2017
  • James D. Hardy Presenter, University of Mississippi Medical Center – Fenestrated Repair of Juxtarenal Abdominal Aortic Aneurysms – May 2016
  • Surgery Grand Rounds; University of South Alabama Medical Center “Abdominal Aortic Aneurysms” – April 2014
  • Co-Author of poster presentation for The Southeastern Surgical Congress meeting 2013 Mesh Wrapping for Traumatic Liver Injury in Pediatric Patients: A Case Presentation and Review of Literature, K. Hummel D.O., S. Brevard M.D., J. Simmons M.D., L. Ferguson D.O., R. Gonzalez M.D.

When not caring for patients, Dr. Ferguson enjoys hunting, fishing, and spending time with his family. He welcomes the opportunity to treat new patients, and the practice accepts most major medical insurance plans.

Michael B. Hogan, M.D.

Dr. Hogan, board-certified in general surgery and fellowship-trained in vascular surgery, joined Vascular Associates of South Alabama in 2019. He has 19 years of experience performing a variety of procedures and treatments, including minimally invasive surgeries such as atherectomy, laser treatments with drug eluting balloon angioplasty, aneurysm repair, carotid disease management, varicose vein treatments, and dialysis access procedures. Dr. Hogan specializes in limb salvage procedures. 

Dr. Hogan received a Bachelor of Science in Biology from Lander University in Greenwood, SC. He attended The University of South Carolina School of Medicine and received his MD. Dr. Hogan did his internship and residency at Keesler Medical Center and completed his Fellowship at The University of Tennessee Chattanooga/ Erlanger Medical Center.

While many procedures can be performed in the diagnostic and interventional lab at our office, Dr. Hogan is also affiliated with Mobile Infirmary Medical Center and Springhill Medical Center. 

Ralph B. Pfeiffer, Jr., M.D., F.A.C.S

Dr. Pfeiffer, a native Alabamian, was born in Birmingham, Alabama and educated at Tulane University in New Orleans, Louisiana. He graduated from the University of Alabama School of Medicine in Birmingham, Alabama in 1970 and completed five years of surgical training at Parkland Memorial Hospital in Dallas, Texas. A subsequent vascular surgery fellowship was completed at Norfolk General Hospital in Norfolk, Virginia. He has practiced vascular surgery on the Gulf Coast for over 38 years.

Additional published articles and presentations by Dr. Pfeiffer as well as complete Curriculum Vitae can be obtained from the office.


  • 1971 - National Board of Medical Examiners
  • 1979 - American Board of Surgery and General Surgery
  • 1983 - American Board of Surgery - Vascular Surgery
  • 1994 - American Board of Surgery - Vascular Surgery, recertified
  • 1997 - Registered Vascular Technologist

Professional Memberships

  • Fellow of the American College of Surgeons
  • American Medical Association
  • Southern Association of Vascular Surgery
  • American Association of Vascular Surgery
  • Alabama Chapter, American College of Surgeons
  • International Society of Endovascular Surgery
  • Mobile County Medical Society
  • Medical Association of the State of Alabama
  • Alabama Vascular Society

Honors and Achievements

  • Clinical Professor of Surgery, University of South Alabama School of Medicine
  • Adjunct Professor of Surgery, Physician Assistant Program, University of South Alabama Medical Center
  • Former President of the Medical Society of Mobile County
  • Former Medical Examiner of the State of Alabama
  • Former Chairman and member of the Mobile Tree Commission
  • Eagle Scout
  • Member of Saint Paul's Episcopal Church
Nicholas S. Clapper, D.O.

Dr. Clapper was born and raised in Mobile, AL and graduated magna cum laude from Spring Hill College. He was also a 4-year letterman with the Spring Hill College baseball team. He then attended Philadelphia College of Osteopathic Medicine and graduated from medical school in 2014. He completed his general surgery residency at the Brookwood Baptist Health System in Birmingham, AL in 2019 followed by two years as a fellow in Vascular Surgery and Endovascular Therapy at the University of Mississippi Medical Center in Jackson, MS which he completed in 2021.

Dr. Clapper is well-trained and skilled in both traditional open surgery as well as endovascular techniques for the wide array of vascular surgical conditions. He has a particular interest in advanced endovascular techniques for the purposes of lower extremity limb salvage, endovascular aortic aneurysm repair, and both surgical and endovascular interventions for carotid arterial disease, including trans-carotid arterial revascularization (TCAR). Additionally, he is well-trained and ready to treat venous conditions including varicose veins and deep venous thrombosis.

Dr. Clapper lives in Mobile with his wife and two daughters. He looks forward to serving the Mobile and surrounding communities. He is affiliated with Mobile Infirmary, Thomas Hospital, and Springhill Medical Center. He is a member of the American College of Surgeons, Society of Vascular Surgery, and the Southern Association of Vascular Surgery. 

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