Physicians & PAs

ROBERT E. ANDERSON, M.D.

EDUCATION

Bachelor of Science-Chemistry, University of
South Dakota, 1978
Medical Degree-University of Minnesota, 1983
Residency-Iowa Methodist Medical Center, 1988
Licenses held in Iowa and South Dakota

AFFILIATIONS

Fellow-American College of Surgeons
Member-American Board of Surgery
Iowa Academy of Surgery
Iowa Medical Society
Woodbury Medical Society
Throckmorton Surgical Society
Honors-Alpha Omega Alpha Medical
Honor Society
Phi Beta Kappa
Certified by American Board of Surgery

AREAS OF SPECIALTY

General Surgery
Laparoscopic Surgery
Trauma Surgery

Began practice in Siouxland in 1988

GARY R. CARLTON, M.D.
EDUCATION

Bachelor of Arts-Cornell University, 1968
Medical Degree-University of Nebraska, 1972
Surgical Residency-VA-St. Elizabeth, 1976
Pediatric Surgery Fellow-Denver Children’s
Hospital, 1979
Licenses held in Iowa, Nebraska, South Dakota and Colorado

AFFILIATIONS

Fellow-American College of Surgeons
Certified by American Board of Surgery
Member-Iowa Academy of Surgery
Iowa Medical Society
North Central Cancer Treatment Group
Woodbury Medical Society

AREAS OF SPECIALTY

General Surgery
Pediatric Surgery
Laparoscopic Surgery
Trauma Surgery

Began practice in Siouxland in 1979

PAUL E. JOHNSON, M.D.
EDUCATION

Bachelor of Science-Chemical Engineering,
University of Iowa, 1973
Medical Degree-Creighton University, 1977
Surgical Residency-Creighton University, 1978-1979
Veterans Administration Medical Center, 1981-1985
Served in U.S. Coast Guard
U.S. Public Health Service
Currently remains an officer in the Reserve of the USPHS
Licenses held in South Dakota, Iowa, Nebraska and Alaska

AFFILIATIONS

Fellow-American College of Surgeons
Member-American Board of Surgery
Iowa Medical Society
Association of Military Surgeons of the United States
Reserve Officers Association
Woodbury Medical Society
American Society of Gastrointestinal Endoscopy
Certified by American Board of Surgery

AREAS OF SPECIALTY

General Surgery
Breast & Abdominal Surgery
Laparoscopic Surgery
Trauma Surgery
Wound Care

Began practice in Siouxland in 1986

WILLIAM A. RIZK, M.D.
EDUCATION

Bachelor of Science, Exercise Physiology- University of Iowa, 1990
Medical Degree-University of South Dakota, 1994
Surgery Residency-Iowa Methodist Medical Center, 1999
Additional Training in Advanced Laparoscopic
Surgery, Shawnee Mission, Kansas, 1999
Board Certified in General Surgery, 2000
Licenses held in Iowa and South Dakota

AFFILIATIONS

Fellow-American College of Surgeons
Member-Iowa Medical Society
Woodbury County Medical Society
Throckmorton Surgical Society
Society of American Gastrointestinal Endoscopic Surgeons
American Society of Bariatric

AREAS OF SPECIALTY

General Surgery
Laparoscopic Surgery
Trauma Surgery
Bariatric Surgery

Began practice in Siouxland in 1999

KEITH A. VOLLSTEDT, M.D.
EDUCATION

Bacheolor of Science-Morningside College, 1983
Medical Degree-University of Iowa College of Medicine, 1987
General Surgery Residency-University of Iowa Hospitals and Clinics, 1992
Board Certified in General Surgery, 1993
Licenses held in Iowa, Nebraska and South Dakota

AFFILIATIONS

Fellow-American College of Surgeons
Certified by American Board of Surgery
Member-American College of Physician Executives
South Dakota State Medical Association
South Dakota Chapter of ACOS
American Medical Association

AREAS OF SPECIALTY

General Surgery
Bariatric Surgery
Peripheral Vascular Surgery
Endoscopic Procedures
Thoracic Surgery

OUTREACH CLINIC

Providence Medical Center, Wayne, NE
Began practice in Siouxland in 1992

LAWRENCE T. VOLZ, M.D.
EDUCATION

Bachelor of Arts-Chemistry, University of San Diego, 1993
Medical Degree-Creighton University School of Medicine, 1997
General and Laparoscopic Surgery Residency-Baystate Medical Center, 2002
Board Certified in General Surgery, 2003
Licenses held in Iowa, Nebraska and South Dakota 

AFFILIATIONS

Fellow-American College of Surgeons
Certified by American Board of Surgery
Member-Society of American Gastrointestinal and Endoscopic Surgeons
American Hernia Society

AREAS OF SPECIALTY

General Surgery
Endoscopic Procedures
Trauma Surgery

Began practice in Siouxland in 2006

MICHAEL L. WOLPERT, M.D.
EDUCATION

Bachelor of Science-Biology, Creighton University
Medical Degree-Creighton University School of Medicine
General Surgery Residency-Creighton University Affiliated Hospitals

AFFILIATIONS

Diplomat-American Board of Surgery
Fellow-American College of Surgeons
Director of Trauma at Mercy Medical Center
Member of the American Society of Bariatric Surgeons (ASBS)

AREAS OF SPECIALTY

General Surgery
Laparoscopic Surgery
Bariatric Surgery
Trauma Surgery

Began practice in Sioux City in 1980

LORI A. HUBERT, P.A.-C.
EDUCATION

Certified Surgical Technician, Western Iowa Tech Community College, 1983
Associate Degree in Nursing, Western Iowa Tech Community College, 1996
Associate Degree in Science, Western Iowa Tech Community College, 1997
Certified-Physician Assistant Studies, University of North Dakota, 2003
Licenses held in Iowa, South Dakota and Nebraska

AFFILIATIONS

Member-American Academy of Physician Assistants
American Academy of Surgical Physician Assistants
Fellow Member-American College of Surgeons

Began practice in Siouxland in 2003

 BRENDA VAN SCOYK, P.A.-C.
EDUCATION

Bachelor of Science-Athletic Training, Minnesota State University, 1996
Bachelor of Science-Physician Assistant Studies, University of South Dakota, 2001
Certification-NCCPA, 2001
Licenses held in Iowa and South Dakota

AFFILIATIONS

Member-American Academy of Physician Assistants
South Dakota Society of Physician Assistants
Iowa Physician Assistant Society

Began practice in Sioux City in 2001

MICHELLE L. DAFFER, M.D.
EDUCATION

Bachelor of Science-Biology, Creighton University, Omaha, NE, 1996
Bachelor of Arts-Psychology, Creighton University, Omaha, NE, 1996
Medical Degree-Creighton University School of Medicine, Omaha, NE, 2000
Dermatology Residency-Texas Tech University
Health Sciences Center-Lubbock, TX, 2004
Licenses held in Iowa and South Dakota

AFFILIATIONS

Member-Certified by American Board of Dermatology
American Academy of Dermatology
American Society for Mohs Surgery
American Society for Dermatologic Surgery
South Dakota State Medical Association
Yankton District Medical Society

AREAS OF SPECIALTY

General Dermatology
Mohs Surgery
Lesion Removal
Botox & Collagen
Sclerotherapy

Began practice in Sioux City, 2004

WILLIAM BLANKENSHIP, M.D.
EDUCATION

BA, With Distinction, University of Nebraska, Lincoln, NE, 1969
Medical Degree-Cornell University Medical College, New York, NY, 1973
Residency-Strong Memorial Hospital, University of Rochester, Rochester, NY, 1977
Licenses held in Iowa and South Dakota

AFFILIATIONS

Member-American Medical Association
American Association of Clinical Endocrinologists
Iowa Medical Society
Woodbury Medical Society
The Endocrine Society
National Lipid Association
South Dakota State Medical Association
Yankton District Medical Society

AREAS OF SPECIALTY

Endocrinology
Internal Medicine

Began practice in Sioux City, 1977

AMY L. DIETRICH, P.A.-C.
EDUCATION

Bachelor of Science, Nursing, Morningside College, Sioux City, IA, 1992
Physician Assistant Program-University of North Dakota, School of Medicine,
Grand Forks, ND, 1996
Certification–NCCPA, 1996
Licenses held in Iowa and South Dakota

AFFILIATIONS

Member-American Academy of Physician
Physician Assistants
Iowa Academy of Physician Assistants
The Endocrine Society
Society of Dermatology Physician Assistants

AREAS OF SPECIALTY

Dermatology
Endocrinology
Internal Medicine

Began practice in Siouxland in 1996