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Tuesday 06th of December 2016
Home Medical
Medical Staff Profiles

Darrick Nelson, M.D.

Chief Medical Officer

Family Medicine Residency Program Director

Originally from a small mining town in Arizona and a U.S. Army Veteran, Dr. Nelson obtained his medical degree from the University of Texas Health Science Center at San Antonio. He graduated Magna Cum Laude from the University of Texas at Dallas with a Bachelor of Science degree in Biology. Prior to joining HMS, Dr. Nelson was a professor and a core faculty member at Texas A&M University Health Science Center, Department of Family and Community Medicine, Corpus Christi Family Medicine Residency Program where he was responsible for the teaching and supervision of residents in outpatient clinics, inpatient hospital, intensive care unit, newborn nursery, labor and delivery, including C-sections, high risk obstetrics, and indigent care. Dr. Nelson is a Fellow in Medical Informatics and was physician liaison for implementation of electronic clinical documentation system with CHRISTUS Spohn Shoreline Hospital.

Dr. Nelson serves as the Chief Medical Officer of HMS, a non-profit, Federally Qualified Health Center with a total of 12 locations in Grant and Hidalgo Counties of southwest New Mexico. Dr. Nelson directs the delivery of patient centered primary care services for HMS as well as leadership and innovation on projects and programs to improve clinical and overall health outcomes for the residents of Southwest New Mexico. In addition to providing direction in all aspects of patient-centered, high quality healthcare, Dr. Nelson is one of the founders of the FORWARD NM – Pathways to Health Careers workforce program at HMS. This 5-stage program reaches students from secondary education throughout graduate degrees and includes the accreditation of the HMS Family Medicine Residency Program, the first Teaching Health Center designation in New Mexico, wherein Dr. Nelson serves as Program Director. This rural model of graduate medical education training is developed in partnership with the University of New Mexico.

In 2012, Dr. Nelson was named the New Mexico Primary Care Association's "Community Health Center Medical Provider for the Year." Dr. Nelson is a Fellow of the National Institute for Program Director Development and serves on the Board of Trustees for Gila Regional Medical Center and is the Chairman of Gila Regional Medical Center's Quality Improvement Committee. Dr. Nelson recently joined the Board of Directors for The National Rural Training Track Campus Collaborative (“The RTT Collaborative” or “RTTCC”), a newly established 501(c)(3) organized to sustain medical education in rural places.


Joyce Troxler, MD.

Associate Medical Director

Family Medicine Core Faculty Member

Dr. Troxler is a bilingual Family Physician specializing in the full spectrum of adult and pediatric care, including obstetrics. Dr. Troxler graduated from the University of New Mexico with her B.A. in Biology and received her M.D. from East Tennessee State University. She completed her residency at the Mountain Area Health Education Center in Asheville, NC.

Originally from the mountains of Tennessee, Dr. Troxler has lived in New Mexico before and is excited to share the beauty of Grant County with her husband and sons.


Dr. Kristan Diaz-Rios, M.D.

Family Medicine Residency Program Associate Director

Dr. Kristan Diaz-Rios is a family practice physician who graduated from Brown University’s Warren Alpert School of Medicine and completed her Family Medicine Residency and Obstetrics Fellowship through Christus Spohn Memorial Hospital in Corpus Christi, TX. While she has a special interest in Women’s Health and Adolescent Medicine, she also enjoys the full spectrum of patients that Family Practice has to offer. In addition to her daily duties, Dr. Diaz recently joined the HMS Family Medicine Residency Program as Associate Program Director.

Dr. Diaz and her husband Rick Rios, D.C., moved to Silver City during the fall of 2012 and are happy to join Hidalgo Medical Services and the Silver City community.

Dr. Diaz enjoys golfing, running and exploring New Mexico with her husband and miniature schnauzer.


Dr. Donald Johnson, M.D.

Dr. Donald Johnson, MD joined Hidalgo Medical Services in August 2005 as a pediatric physician. Prior to joining HMS, Dr. Johnson practiced nine years as a private physician with Gila Pediatrics. In addition to his distinguished career as a private physician, Dr. Johnson has served as the Chief of Pediatrics at Gila Regional Medical Center, Chief of Pediatrics at Borgess Medical Center and Pediatric Coordinator for the Southwestern Michigan Area Health Education Center.

Dr. Johnson is a member of the Michigan State Medical Society, the New Mexico Medical Society, and the New Mexico Pediatric Society. Dr. Johnson is certified by the American Board of Pediatrics, a Fellow of the American Academy of Pediatrics, and a Diplomat of the National Board of Medical Examiners. Dr. Johnson has held teaching appointments as a lecturer in Pediatrics with Tufts New England Medical Center in Boston Massachusetts. Dr. Johnson has been an Assistant Clinical Professor Department of Human Development at Michigan State University and Adjunct Clinical Professor of Pediatrics at Western Michigan University. Dr. Johnson received his doctorate of medicine from Northwestern Medical School.


Dr. Michelle Pahl. M.D.

Dr. Pahl specializes in the care of infants, children, adolescents and adults, and is board certified in Pediatrics and Internal Medicine.

Dr. Pahl grew up in Illinois and received a bachelor's degree in fine art photography from Columbia College in Chicago. She worked in the field of commercial art in Chicago, New York City and Portland, Maine. Opting for a change in career paths, she pursued entry to medical school by first fulfilling the prerequisites at the University of Southern Maine in Portland. She graduated from the University of Vermont College of Medicine in 2005 and completed her combined internal medicine and pediatric residency at Hershey Medical Center in Hershey, Pennsylvania in 2009.

Dr. Pahl lives in Silver City and enjoys hiking, road and mountain biking, and spending time with her dogs.


Dr. Forrest Eugene Henry, D.O.

Hidalgo Medical Services (HMS) is pleased to announce the addition of Dr. Forrest Henry, Board Certified Family Practice Physician to the professional medical staff, practicing in the HMS Lordsburg Clinic. Dr. Henry graduated from Philadelphia College of Osteopathic Medicine and completed his Family Practice Residency through Clarion Hospital, in Clarion Pennsylvania where he served as the Chief Resident. Upon completion of residency he served as the Chief of the Family Practice Department of Clarion Hospital. Dr. Henry and his family moved to Silver City, NM in 2007 and he joined Southwest Family Medicine practice. Prior to coming to Silver City Dr. Henry practiced Family Medicine in Brookville and Foxburg, Pennsylvania.

Dr. Henry served in the US Army as a General Medical Officer stationed in Bad Kreuanach, Germany for four and half years. His achievements include:

Medical Officer on a medical mission to Nigeria in 2008, Board of Directors, Soul Caring Outreach Inc. 2008 to present, IPA Board 2007 to present, Board of Directors Clarion Forrest Visiting Nurse Association 2001 to 2004, Mental Health Drug and Alcohol Advisory Board from 2001 to 2004.


Dr. Irma Mariana Santiago, M. D.

Dr. Irma Mariana Santiago completed her medical school education and Family Medicine residency training at the University of New Mexico. She joined HMS in August 2012, where she is engaged in a full scope practice, including OB. She is originally from Puerto Rico. She is fully bilingual in Spanish and English.


Dr. Jonathan Jones, D.O.

Dr. Jones is a Bi-lingual (English/Spanish) Board Certified Pediatrician. Originally from Mesa, Arizona Dr. Jones and his family recently moved to the area. He graduated in the top 10 of his class from Midwestern University-Arizona College of Osteopathic Medicine, Glendale Arizona. Dr. Jones completed his Pediatric Residency Program at Phoenix Children’s Hospital/Maricopa Medical Center. Prior to joining HMS Dr. Jones was in practice for five years with Gilbert Pediatrics



Dr. Ben Cluff, M.D.

Dr. Cluff graduated from Northern Arizona University with a B.S. in Biology and earned his M.D. from American University of the Caribbean School of Medicine. He completed his intern year of Family Medicine Residency at the University of New Mexico, Albuquerque. Growing up in a rural northern Arizona town, Dr. Cluff appreciates the well-kept secrets of life in a small town. He is very excited to continue his graduate medical education training at Hidalgo Medical Services with a focus on rural Family Medicine.

Dr. Cluff joins the Silver City community with his wife, Jill, and three children. They look forward to getting to know the people of southwest New Mexico and to getting involved in the community. The Cluffs enjoy spending time together in the outdoors, hiking, camping, and fishing.


Dr. Cid Sumulong, M.D.

Although born in Chicago, Dr. Cid Sumulong grew up in Southern California, the eldest son of two nurses. Actively participating in medical mission work in the Philippines as well as organizing hospice volunteers to visit terminally ill patients, his passion to care for the underserved and excellent bedside manner was already evident, even in his undergraduate years. He graduated Summa Cum Laude from California State University, Fullerton with a Bachelor of Science Degree in Biology and a minor in Chemistry.

For his work as a Program Director for Hospice Project Grace, he was awarded the California State University S.T.A.R.S. (Students That Are Recognized for Service) Award in 2003 and once again with the Kenneth –Goodhue McWilliams CSU, Fullerton Award for Outstanding Community Service in 2004.

As a medical student, he provided medical care for the homeless of Downtown Los Angeles through the UCLA Mobile Clinic. Dedicated to the cause of Primary Care, with the support of the American Medical Association, he was actively involved with law makers and lobbyists in Sacramento, California where he fought for the continued state funding of the Steven M. Thompson Physician Corps Loan Repayment Program, a loan repayment program designed to recruit more primary care physicians to work in underserved Health Professional Shortage Areas in California. In addition to performing geriatric research, he was also one of the Co-Presidents of the Geriatric Medicine Interest Group. Dr. Sumulong received his doctorate of medicine from the David Geffen School of Medicine at UCLA.

Dr. Sumulong is excited to be in Silver City and part of the HMS Family Medicine Residency Program. Dr. Sumulong enjoys reading, hiking, biking and spending quality family time with his wife, Lindsey and daughter, Misha.


Dr. Rick Rios Jr., D.C.

Dr. Rick Rios is a Chiropractic Provider. He graduated from the University of Texas Pan American in 2003 with a bachelor degree in Biology and Chemistry. He then received his Doctorate of Chiropractic from Parker College of Chiropractic in 2007. He moved to Corpus Christi and joined Armadillo Sports Chiropractic where he focused on sports therapy and rehab. He worked closely with the TAMU Corpus Christi athletes as well as many other events in the community. In 2009 he moved to San Antonio and joined Airrosti Rehab Center, where he worked with a wide spectrum of patients.

In October 2012 Dr. Rios and his wife Dr. Kristan Diaz-Rios moved to Silver City and joined the HMS community.

Rick enjoys hunting, fishing and golfing with his wife.


Mona Flores, M.D.

Dr. Flores was born and raised in Silver City, and attended Silver High School and later Western New Mexico University where she earned a Bachelors of Science degree and Nursing Degree. Dr. Flores worked briefly as a registered nurse at Fort Bayard Medical Center and Gila Regional Medical Center, where she later decided to pursue a career in Medicine. Dr. Flores earned a doctorate degree at the University Of New Mexico School Of Medicine, and also completed her residency at the University of New Mexico Family Medicine Residency program, where she established a special interest in preventative medicine and women’s health. Dr. Flores has returned home to her roots and her family to practice in the town that she grew up in, Dr. Flores enjoys the small town charm, which enables her to care for multiple generations of families and to provide continuity of care. Dr. Flores also enjoys the gentle climate and beautiful scenery of Silver City. Her hobbies include spending time with her family and friends, observing as well as participating sporting events and cooking.


Rachel Seltzer, M.D.


Dr. Seltzer is proud to join the HMS family. She has lived in a number of places, but home is where her dog is, and she and her pointer, Sophie, are very excited about their new home in Silver City. Rachel graduated from Wesleyan University in Middletown, Connecticut, with a Bachelor of Arts in Neuroscience & Behavior and also obtained her Master of Arts in Medical Science from Loyola University Chicago. Dr. Seltzer received her Medical Doctorate degree from Oregon Health & Science University (OHSU), and is currently completing her Preventive Medicine Residency training at OHSU, along with a Master of Public Health degree at Portland State University. Dr. Seltzer will join the Class of 2016 at the HMS Family Medicine Residency Program in October, upon completion of her studies in Oregon. Her professional interests center on health and wellness in rural communities, regional health systems, and a broad scope of care in the inpatient and outpatient settings. In her spare time, her avocational interests include spending time with her partner Aaron, running, yoga, doing laundry, working, studying, knitting, self-improvement, enjoying good food, and exploring, especially places within driving distance.


Alan Schumacher, M.D.


Dr. Alan Schumacher is pleased and excited to join Hidalgo Medical Services (HMS) in Silver City, New Mexico, as a resident physician. Alan began pursuing his passion for medicine in 1986. After obtaining a Bachelors Degree in Biology, with a Minor in Philosophy, he immediately matriculated to the University of Louisville School of Medicine. Due to unforeseeable circumstances at the end of one year, he and his family moved to Tucson, Arizona where his focus shifted to a career in the insurance industry. He obtained Masters-level certification in Property and Casualty and Life insurance. As an insurance agent and financial asset manager, Alan continued to consider how he might be of greater service in his community. He enrolled in graduate school at the University of Arizona and as he worked toward his PhD in Physiology, he researched macular degeneration and congestive heart failure. It was during this time that he had the great fortune to return to medical school. He graduated from the University of Arizona College of Medicine with a Doctorate in Allopathic Medicine in 2012 at the age of 50 years young. Alan is a family man. He has four grown children, two by adoption, with a total of six grandchildren. He remarried in 2010 and he and his wife have two daughters, a 9-month-old and a 3-year-old. Alan enjoys tennis, poker, hunting, martial arts and almost any outdoor recreation.


Jennifer White, FNP, CNM Clinical Information Officer/Assistant Medical Director

Jennifer White is a Family Nurse Practitioner as well as a Certified Nurse Midwife. She received her Bachelor of Science in Nursing degree from Middle Tennessee State University in Murfreesboro, Tennessee in 2001. She went on to attend Vanderbilt University’s dual program in Nurse Midwifery and Family Nurse Practitioner in Nashville, Tennessee. In 2005, she earned her degree from Vanderbilt University as a Nurse Midwife and Family Nurse Practitioner.

Jennifer has practiced in at a birth center in Texas, and most recently in a large public health hospital in Denver, Colorado, before relocating to Silver City. She has delivered over 300 bouncing babies and enjoys working at Hidalgo Medical Services where she can provide care for the whole family- not just the moms and babies. Born and raised in Mississippi, Jennifer enjoys music, especially the blues. She sings and plays guitar in her free time. Happy to be here in Silver City, she also enjoys hiking, biking and seeing the sights in New Mexico.


Marlene Baska, PA-C

Marlene Baska joined Hidalgo Medical Services as a Physician Assistant specializing in Family Practice at the Cobre Health Center in February 2004. She has been a physician assistant since 1988, working in Arizona, New Mexico, Alaska, and Oregon. Marlene’s educational background includes a registered nursing degree from Lane Community College, in Oregon and certification as a physician assistant from the University Of Utah School Of Medicine.


Meredith Heidenfeld, PA-C

Meredith Heidenfeld joined the staff at Hidalgo Medical Services Med Square Clinic as a Physician Assistant in May 2004, specializing in Family Practice. Meredith has thirteen years prior experience as a physician assistant including family practices in New York, Ohio, and Arkansas. She received her BS degree as a Physician Assistant from State University of New York at Stony Brook.


Jill Steidl, PA-C

Jill Steidl received her BS and Physician Assistant Certification from King’s College in Pennsylvania, where she was awarded Magna Cum Laude for academic and clinical excellence. She came to New Mexico in March 2004 and has practiced at the HMS Med Square clinic and Cliff/Gila Clinic for the last year, where she has provided care in the specialty area of family practice. Prior to that, she practiced family medicine in Pennsylvania.


Julie Fitzgerald, PA-C

Originally from Michigan, Ms. Fitzgerald and her family moved to Silver City from Oregon in 1994. Julie completed her Bachelor of Science degree in chemistry at Western New Mexico University, graduating with high honors. Julie is a graduate of the Physician Assistant program at the University of New Mexico, where she participated in several community health projects, including healthcare for the homeless. Before pursuing her lifelong dream of practicing medicine, Julie was a home visitor with First Born Program of Grant County. She also gained valuable experience as the supervisor of a clinical lab and has experience as a medical researcher in the areas of breast cancer, melanoma, kidney stones and osteoporosis. Now that she is back in Silver City, Julie is looking forward to forming partnerships with her patients in getting healthy and staying healthy. Ms. Fitzgerald enjoys treating the entire family.


Alexander Goldner, MPAS, PA-C

Alex grew up in the Willamette Valley in western Oregon. Having an interest in human behavior and mental health, and interested in a profession working with people, he graduated with a Bachelor of Science in Psychology in 2007 from Oregon State University. After working in IT for two years, he moved to Albuquerque in 2009, when his wife began graduate studies in ceramics at the University of New Mexico. Alex volunteered at Albuquerque Health Care for Homeless, became an EMT, and worked in mental health in Albuquerque before being accepted to University of New Mexico's Physician Assistant program. As part of his training at UNM, he completed a rotation with HMS and fell in love with the organization, Silver City, and the beautiful Gila wilderness. He graduated with a Master of Science in Physician Assistant Studies in August of 2013, and joined HMS in October. Alex provides primary care to all ages, with an emphasis on patient education, personalized treatment, and quality, evidence-based care.


Clinic Phone Numbers

24/7 Mental Health Crisis Line


Silver City: 575-388-1511

Lordsburg: 575-542-8384


Animas: 575-548-2742

Bayard: 575-537-5068

Cliff/Gila: 575-535-4384

Mimbres Valley: 575-536-3990

Family Support Services:

        Silver City: 575-534-0248

        Lordsburg: 1-888-LAVIDA5

Provider Job Posts

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