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Medical Directors

Gregory K. Mayer, MD, MBA

MD, Tulane University School of Medicine
MBA, International Management, Thunderbird School of Global Management
Board Certification: Hospice & Palliative Medicine

Dr. Mayer is senior vice president for clinical operations. Prior to joining Hospice of the Valley in 1997, Dr. Mayer practiced general surgery for more than 10 years in the Phoenix metropolitan area. He received his postgraduate training in general surgery at the Mayo Graduate School of Medicine in Rochester, Minnesota. Currently, Dr. Mayer serves as a staff consultant for the Mayo Clinic Arizona’s Palliative Medicine Service. Professional memberships include the American Medical Association, the Arizona Medical Association and the American Academy of Hospice and Palliative Medicine. In addition, Dr. Mayer is a current member of the Mayo Clinic Alumni Association Board of Directors.

Gillian Hamilton, MD, PhD

MD, University of Arizona, Tucson
PhD, University of Florida (physiological and clinical psychology)
Board Certification: Geriatrics; Internal 
Medicine; Hospice & Palliative Medicine

Dr. Hamilton serves as vice president education/innovation. She created innovative programs that go beyond the standard level of hospice care, such as the Dementia, Pulmonary, Congestive Heart Failure and Pet Connections programs. She oversees grant-funded medical education programs in palliative care for Maricopa County’s health-care providers. She is listed in “Best Docs of America” and Phoenix magazine’s “Top Docs.” Dr. Hamilton joined Hospice of the Valley in 1996. She is board certified in Internal Medicine, Geriatrics, Hospice and Palliative Medicine.

David Butler, MD

MD, Medical College of Wisconsin, Milwaukee
Board Certification: Internal Medicine;
Pediatrics; Hospice & Palliative Medicine

Dr. Butler is executive medical director, overseeing more than 50 physicians and nurse practitioners at Hospice of the Valley. He completed his combined Internal Medicine and Pediatrics residency at Phoenix Children’s Hospital and Good Samaritan Hospital. Dr. Butler joined Hospice of the Valley in 2006; he is board certified in Internal Medicine, Pediatrics and Hospice and Palliative Medicine. He is a medical director at Ryan House, a pediatric respite inpatient home for children with life-threatening illnesses that is operated in partnership with Hospice of the Valley.     

Alicia Acevedo, MD

MD, University of Arizona College of Medicine

Tariq Al-Mutawa, MD

University of Arizona, Tucson
Board Certification: Hospice and Palliative Medicine

Alan Andresen, MD

MD, Autonomous University of Guadalajara, Mexico
Board Certification: Family Practice

Nili Azhar, MD

University of Virginia School of Medicine, Charlottesville, Virginia
Board Certification: Internal Medicine

Kevin Berger, MD

MD, University of the Witwatersrand, Johannesburg
Board Certification: Pediatrics; Hospice & Palliative Medicine

Wendy Bernatavicius, MD

MD, Drexel University College of Medicine
Board Certification: Pediatrics; Hospice & Palliative Medicine

Jeanette Boohene, MD

University of Newcastle-Upon-Tyne, England
Board Certification: Internal Medicine; Hospice & Palliative Medicine

Franc W. Brodar, MD

MD, Jefferson Medical College, Philadelphia
Board Certification: Internal Medicine

Francisco Cordova, MD

MD, University of Arizona College of Medicine
Board Certification: Hospice & Palliative Medicine; Internal Medicine

Deepa Dharmarajan, MD

MD, University of Calicut, Medical College, Thrissur, India
Board Certification: Family Medicine, Geriatric Medicine
 

Mark Edwin, MD

MD, McGill University, Montreal
Board Certification: Family Practice; 
Hospice & Palliative Medicine

Shiri Etzioni, MD

MD, Albany Medical College
Board Certification: Internal Medicine; Hospice & Palliative Medicine

Tom Fitch, MD

MD, University of Kansas, Kansas City
Board Certification: Internal Medicine;
Palliative Medicine; Hematology; Oncology

Patrick Gaylor, DO

DO, Texas College of Osteopathic Medicine
Board Certification: Internal Medicine

Anne Gilbertson, MD

MD, University of Arizona, Tucson
Board Certification: Family Practice; Hospice & Palliative Medicine

Joanne Gurin, MD

MD, State University of New York, Brooklyn
Board Certification: Internal Medicine

Amy Ha, MD

MD, Saba University School of Medicine, Saba, Netherlands-Antilles
Board Certification: Internal Medicine (Diplomat); Hospice & Palliative Care; Geriatrics
 

John Hortareas, DO

DO, College of Osteopathic Medicine,
Pomona, CA
Board Certification: Internal Medicine; Hospice & Palliative Medicine
 

Melissa Hulsing, MD

MD, University of Iowa College of Medicine
Board Certification: Family Practice

Sally Kalpakoff, DO

DO, Philadelphia College of Osteopathic
Medicine, Philadelphia
Board Certification: Family Medicine;
Geriatrics; Hospice & Palliative Medicine
 

Todd Kravetz, MD

MD, Medical College of Ohio, Toledo, Ohio
Board Certification: Internal Medicine

Shelly R. Myers, DO

DO, Arizona College of Osteopathic Medicine of Midwestern University, Glendale, AZ
Board Certification: Family Medicine
 

Gobi K. Paramanandam, MD

MD, Northeastern Ohio Universities College of Medicine
MHSM, W.P. Carey School of Business, ASU
Board Certficiation: Family Medicine, Hospice & Palliative Medicine
 

Jay B. Patel, MD

NHL Municipal Medical College, Ahmedabad, Gujarat, India
Board Certification: Internal Medicine

Lori Porter, DO

Midwestern University/Chicago College of Osteopathic Medicine
Board Certification: Internal Medicine

Eric Prommer, MD

MD, Feinberg School of Medicine,
Northwestern University, Chicago
Board Certification: Hematology;
Oncology; Hospice & Palliative Medicine

Nisal Samarasekera, MD

MD, University of Colorado School of Medicine, Denver
Board Certification: Family Medicine;
Hospice & Palliative Medicine

Juanita M. Sapp, MD

MD, Creighton University, Omaha
Board Certification: Internal Medicine; 
Hospice & Palliative Medicine

Tressia Shaw, MD

MD, University of Arizona, Tucson
Board Certification: Internal Medicine; Pediatrics

Sukhjit Singh, MD

MD, Dayanand Medical College, Punjab University, India
Board Certification: Internal Medicine; Hospice & Palliative Medicine

Vandana Sinha, MD

MD, Autonomous University of Guadalajara, Mexico
Board Certification: Family Practice

Theresa Stevens, MD

MD, Medical College of Wisconsin, Milwaukee
Board Certification: Internal Medicine

Ned Stolzberg, MD

MD, University of Massachusetts, Worcester
Board Certification: Family Practice;
Hospice & Palliative Medicine

José Urdaneta, MD

MD, University of Kansas School of Medicine
Board Certification: Internal Medicine; Psychiatry; Hospice & Palliative Medicine, Psychosomatic Medicine
 

Amruta Vadnerkar, MD

MD, Dr. D.Y. Patil Medical College, Bombay University, New Bombay, India
Board Certification: Internal Medicine; Geriatric Medicine; Hospice & Palliative Medicine
 

Janelle Weyer, MD

MD, University of Arizona College of Medicine
Board Certification: Internal Medicine
 

John J. Williams, MD

MD, University of Arizona, Tucson
Board Certification: Family Medicine; Hospice & Palliative Medicine

Sara Wordingham, MD

MD, Medical College of Wisconsin, Milwaukee, WI Board Certification: Internal Medicine

William Zipperer, Jr., DO

DO, Philadelphia College of Osteopathic Medicine
Board Certification: Internal Medicine;
Geriatrics; Hospice & Palliative Medicine

Nurse Practitioners

Martha Abruzzese, NP

MSN, Grand Canyon University, Phoenix AZ
Board Certification: Family Nurse Practitioner

Carol Bemis, NP

MSN, Arizona State University
Board Certification: Hospice & Palliative Care
 

Melissa Bush, NP

Massachusetts General Hospital Institute of Health Professions, Boston – MSN (Specialty – Gerontology)
Arizona State University – Adult Nurse Practitioner
Board Certified: Adult Nurse Practitioner, Gerontological Nurse Practitioner

Colleen Gumm, NP

MSN, Gerontologic Nurse Practitioner, University of Pennsylvania, PA
Board Certification: Geriatric Nurse Practitioner

Troy Hunter, NP

MSN, University of Utah, Salt Lake City, Utah
Board Certification: Family Nurse Practitioner

Karen Lottis, NP

PhD, MSN, University of New Mexico, Albuquerque, NM
Board Certification: Family Nurse Practitioner

Lesa Reda, NP

University of Phoenix - MSN, Family Nurse Practitioner
Board Certification: Family Nurse Practitioner
 

Tracy Salem, NP

Columbia University School of Nursing - MSN, Adult & Geriatric Nurse Practitioner

Katy Scherger, NP

University of Texas at Arlington - Gerontological Nurse Practitioner
Board Certification: Gerontological Nurse Practitioner

Rebecca Stuvengen, NP

MSN, Concordia University, Wisconsin
Board Certification: Family Nurse Practitioner
 

Anabell Castro Thompson, NP

Arizona State University - MSN, Adult Nurse Practitioner
Board Certification: Adult Nurse Practitioner