Our Staff

We offer a team of dedicated professionals who are trained to manage a continuum of healthcare needs and promote positive patient centered outcomes.

Our Staff

We offer a team of dedicated professionals who are trained to manage a continuum of healthcare needs and promote positive patient centered outcomes.

Meet the team ↓

Dr. Jason Martin is the founder/owner of Geriatric Post-Acute Specialists (GPS) and remains active in patient care. Dr. Martin started Geriatric Post-Acute Specialists in 2015.  Originally from Houston, Texas he graduated from the University of Texas in 2002 with a degree in Microbiology. He attended St. George’s University School of Medicine from 2003-2007, then completed his Internal Medicine Residency at UTMB Galveston from 2007-2010, where he was awarded the Resident of the Year in 2010. In 2010, he started with Seton Adult Medical Services (SAIMS) as a Hospitalist and has now transitioned to Sound Physicians. After serving as the Chief Hospitalist for several years he has recently taken on the role of Chief Medical Officer for Ascension Medical Center Main. Dr. Martin and GPS are focused on improving quality, patient experience, and reducing the cost of care. Our goal is to help patients make a smooth transition from the hospital to their next level of care.

I have been practicing medicine since 2011, after finishing my training at Internal Medicine Residency Program, UTSW – Austin. I work as a hospitalist at Seton Williamson and also see patients at skilled nursing facilities and rehabilitation centers. I feel blessed to be a physician, since this allows me to take care of patients and help not only sick people, but also to make a positive impact on the lives of their loved ones. I feel gratified and rewarded each day at my job when I can make a patient feel better and am able to comfort their family as well.

I am Board Certified in Internal Medicine and I am also a National Academy of Sports Medicine certified personal trainer. The goal of my private concierge practice is to bridge medicine with fitness. This holistic approach allows me to approach patient care from a nutrition, fitness and biochemical standpoint. I love working in all areas of medicine including private practice and inpatient hospitalist medicine. I have also held medical directorships in a nursing home and a hospice facility. Furthermore, I have extensive experience working with patients in the Rehab and Long Term Acute Care settings as well. My main hobby is weight lifting and fitness training.
I’m very passionate about this and constantly post video and informational updates for free on my Instagram page @ramdeenmd.

Dr. Cruz is Board Certified in Internal Medicine. He attended medical school at the University of North Texas Health Science Center Fort Worth, Texas doctor of Osteopathy August 1992 to June 1996. He then completed his residency at the University of Texas Medical Branch Hospitals Galveston, Texas Internal Medicine July 1996 to June 1999.
“I chose medicine for the patient care and to develop interpersonal relationships.”
He is married with two children, and enjoys traveling with his family.

Dr. Aneesh George is an Internist/Hospitalist at the Dell Seton Medical Center at the University of Texas. Dr. George earned his medical degree from the University of Calicut, Kerala in India. He completed his residency training in Internal Medicine at UT Southwestern Residency Program at Seton in Austin,TX. He is board certified in Internal Medicine. Dr. George was awarded the most valuable Physician of the year in 2015 at St. David’s Round Rock Medical Center. He also published an article in the Cleveland Clinic Journal of Medicine, a case of chronic lymphocytic leukemia (CLL) in 2012.

Dr. Gheewala is Board Certified in Internal Medicine. She attended medical school at Tuffs University School of Medicine, then completed residency at Tuffs Medical Center in Boston, Massachusetts. Dr. Gheewala is a Hospitalist at Seton Medical Center Austin.
“When an old and wise man is speaking, listen to him with respect; but do not believe him. Always think for yourself.” – Linus Pauling, Nobel Laureate. I truly believe in practicing evidence-based medicine and being an advocate for my patients. I am originally from Boston. Relatively new to Austin, I enjoy checking out museums, new restaurants and the outdoors with my husband and young children.

Dr. Gowrigari is Board Certified in Internal Medicine. She attended Kurnol Medical College, then completed residency at University Medical Center Brackenridge in Austin, Texas. Dr. Gowrigari is a Hospitalist at Seton Northwest Hospital.”I believe staying healthy is the biggest treasure anyone can have. However, the journey of life can take a toll on our bodies and could compromise our health. As a physician, my goal is to help you regain your most valuable possession – your health. I enjoy the hot weather and the diversity of events that Austin offers. I frequently try to explore ‘beautiful Austin’ with my husband and young daughter. I also enjoy watching movies of various regions, as they give me insight to different cultures.”

Michael Gutierrez, MD is board certified in Internal Medicine. Dr. Gutierrez received his undergraduate degree in Political Science from Pepperdine University and his medical doctorate from The University of Missouri-Kansas City School of Medicine. He completed his internal medicine residency at the University of Kansas Medical Center in Kansas City, Missouri. “I enjoy spending time with my wife and our dog named Daisy. I love the outdoors, traveling, reading about history, exercising and rooting for the San Antonio Spurs, Chicago Bears and UT Longhorns. I consider myself family-oriented, and I love spending time with friends.” Dr. Gutierrez is a Hospitalist at Seton Medical Center Austin.

Dr. Jackson is Board Certified in Internal Medicine. He attended medical school at the University of New Mexico School of Medicine, then completed his residency at the University of Massachusetts Medical Center in Worcester, Massachusetts.
“My patients health and well-being is my main priority.”

Born and raised in Arizona, Dr. Mann received a B.S. in Physics before attending University of Arizona in Tucson for medical school. Upon completion of an M.D, he went on to medical training in Internal Medicine at The Mount Sinai Hospital in New York, NY. He has since practiced Internal Medicine as a hospitalist at Mount Sinai then briefly on the California coast. Since 2015, Dr. Mann has called Austin, TX, home and spends much of his free time exploring the parks and waterways of central Texas with his wife Nicole and their dog Cilantro. Dr. Mann is interested in nutrition and advocates food as the most powerful medicine for prevention and treatment of chronic disease. He is particularly interested in type 2 diabetes, obesity, hypertension and cardiovascular disease.

Zahir Momin, MD is board certified in Internal Medicine and has been in health care for 23 years, having completed his residency in New Rochelle, New York. In his spare time, he enjoys cricket and is very interested in American History. He and his team see patients in your facility and would love an opportunity to assist in your care. Please speak with your nurse to schedule a personal visit. Dr. Momin is Board Certified in Internal Medicine and a Hospitalist at Seton Medical Center Hospital

Dr. Roy is Board Certified in Internal Medicine. He attended Saba School of Medicine, then completed his residency at Case Wester Reserve University in Cleveland, Ohio. “I believe every patient should be treated with dignity and respect. In my daily practice, I try to address all the questions and concerns my patients may have. I enjoy volunteering my time with humanitarian organizations, especially traveling abroad with medical missions to help build communities and provide medical care to rural parts of India. My other interests include mountain biking and water sports such as snorkeling and surfing. I speak Hindi and Bengali.” Dr. Roy is a Hospitalist at Cedar Park Regional Medical Center.

Dr. Tolan is Board Certified in Internal Medicine and Pediatrics. He attended medical school at the University of Houston, then completed his residency at Duke University in Durham, North Carolina. “For some time, medicine has been a calling, a vocation more than a profession. It is a chance to unite my gifts and desire to care for people with one of the world’s most pressing needs. I am grateful for the training and daily opportunities to improve the lives of both the patient and the family, and it is a privilege to be part of the healing and welfare of a community. I am a Texas native from San Antonio and am happy to be back in the state. I enjoy the outdoors, fishing, live music, biking, skiing, landscaping, rock-crawling, and, of course, BBQ.” Dr.Tolan is a Hospitalist at Dell Seton Medical Center.

Mangesh Bhatta, MD
Mangesh Bhatta, M.D. I have been boarded in Internal Medicine since 2015 (ABIM). I completed my Internship/Residency in 2015 from New York Methodist Hospital (now, New York-Presbyterian Brooklyn Methodist Hospital). I finished my medical studies from Ross University School of Medicine (2012). I have been practicing as a hospitalist since 2015.

Albert Arthur, MD
I am board certified through the American Board of Family Medicine and a member of the American Academy of Family Physicians. I obtained my medical degree from Ross University School of Medicine and completed my residency at the University of Mississippi Medical Center (UMMC). I worked as a hospitalist at Baylor Scott and White (Waco, TX) after residency and then moved to Pflugerville to work with Seton Medical Center in Austin, TX. I received my Bachelor of Science in Biology from Edinboro University of Pennsylvania and went on to obtain my Bachelor of Science in Nursing at Thomas Jefferson University in Philadelphia where I worked as a registered nurse for 3 years.

Suma Gowda, MD

Carolyn Crispell, DO

Mauricio Sardan, MD

Samira Shahnaz, MD

David Boltan, MD

Steven Ramdeen, MD

Amita Aghera received her RN from the Amarillo College at Amarillo in 2004 and BSN from the University of Kansas in 2008. She gained experience in the medical-surgical, critical care and telemetry units. She worked as a hospital supervisor/chart nurse before returning to school to obtain her MSN. She graduated in 2017 from the University of Chamberlain College of Nursing with board certification as a Family Nurse Practitioner. She is passionate about providing excellent care for all people. Amita values giving individualized, evidence-based, and quality care to her patients. She is a member of AANP. In her spare time, she enjoys shopping, watching TV and spending time with her family and friends.

Sarah Martin, AGNP, is a nurse practitioner specializing in internal medicine. She also has an interest in palliative care and hospice. Sarah received her degree as an adult/geriatric nurse practitioner from the University of Cincinnati College of Nursing. Prior to becoming a nurse practitioner, she spent several years as an ICU and hospice nurse.

I am a board certified Physician Assistant. I received my Masters of Physician Assistant studies degree from Baylor College of Medicine, Houston, Texas. I also have Masters in chemistry from Stevens Institute of Technology, NJ and did pharmaceutical research prior to going into PA school. I have enjoyed the opportunities to observe the diversity of medicine from bench research to clinical medicine. I am thrilled to be working as internal medicine PA in an acute care hospital. I am a member of AAPA. When I am not with patients, I enjoy spending time with my family, sewing and painting.

Zarintaj Ali (Gina), Acute Care Nurse Practitioner, nationally certified from ANCC and AACN, Texas Board Licensure, started her nursing career as Licensed Vocational Nurse in 2005, bridged to Associate degree in nursing, then baccalaureate, and Master’s Degree in Nursing, worked as Oncology Nurse, critical care nurse and float pool, received experience in all specialty departments of medical field. She believes in Patient-Centered Care, integrates evidenced-based practice in the treatment, compassion and provides quality care to the patients. In the spare times, she likes to spend times with family, exercise, and above all shopping.

Jeremy earned a Master of Science degree as an Acute Care Nurse Practitioner in 2008 from the University of Texas-Health Science Center in Houston, and has been working in ICU settings with Pulmonary and Critical Care physicians since. Prior to becoming a Nurse Practitioner, he worked as a bedside nurse in a Medical ICU at a large hospital in the Houston Medical Center for 5 years, and spent 4 years as an enlisted member of the US Air Force. In his free time, he enjoys spending time with his wife, son, and 2 (crazy!) cats, as well as cycling, and occasionally dabbling in brewing beer.

Anu Rose Antony FNP-C, holds a Master’s degree in Nursing from the Texas State University and is currently working as a nurse practitioner at Geriatric Post Acute care specialist. Her clinic of practice is at Pflugerville Nursing and Rehabilitation Center. Anu has more than 15 years of nursing experience, including orthopedics, medical surgical, oncology and dialysis. She is also certified in Orthopedic and Medical Surgical Nursing. Anu is a strong advocate for compassionate patient care and has a passion for Geriatric population. Before joining GPS, Anu worked as an NP at the Pain Specialists of Austin, Killeen and has served patients with chronic pain. Anu is also an active member of American Association of Nurse Practitioners. Originally from India, Anu and her family migrated to the United States in 2004. Outside of work, she enjoys cooking and spending time with her loving husband Vince and their two sons Steven and Andrew.

I am an Acute Geriatric Adult Care Nurse practitioner- Board certified. I completed my Masters in Nursing at Maryville University in 2018. I received my BSN degree in the Philippines in 1989 where I worked for three years and relocated here in the US in 1993. Ever since then I had been working mostly in the Intensive care Unit. I am a member of the American Nurses Association and Sigma Theta Tau International Honor Society. I enjoy traveling with family and friends as well as home decorating and cooking. I am very passionate about nursing and decided to pursue my professional career with the belief that I could continue delivering a holistic and patient-centered care to every patient.

Sherri Cook-Rousey is an Adult-Gerontology Acute Care Nurse Practitioner who has beenpracticing since 2015. She has experience in skilled nursing, in-patient rehab and is currently practicing at a long-term acute care hospital. Sherri has over 10 years of nursing experience as an ICU nurse. She earned her Associate Degree in Nursing from Temple College, Temple Texas, her Bachelor of Science in Nursing from University of Texas at Arlington, Arlington Texas and her Masters in Nursing at Texas Tech University Health Sciences Center, Lubbock Texas.
Sherri is a member of several professional organizations including American Association of Nurse Practitioners, Austin Area Nurse Practitioners, American Association of Critical Care Nurses and Sigma Theta Tau (Honor Society of Nursing). She enjoys being a mentor/preceptor for Nurse Practitioner students. When she is not working, Sherri enjoys spending time with her husband and their dog, reading, yoga and travel.

Julie Thielke, APRN, FNP-BC

Christine Deogracias joined Geriatric Post-Acute Specialists in 2016. She earned her Master’s of Science in Nursing at Walden University in 2015. She has wored at Cleveland Clinic Medical Intensive Care Unit and Clinical Decision Unit. She has also worked at Seton Medical Center Williamson in the Intensive Care Unit before transitioning to a family nurse practitioner. She is board-certified by American Association of Nurse Practitioners and is currently serving on the board of Advance Practice Nurses as Social Media Coordinator. During her free time, she enjoys taking walks with her energetic Jack Russell Terrier at Lake Pflugerville.

Cassandra Hollifield is a board certified Physician Assistant. She received her Bachelor of Arts in Chemistry with a minor in Spanish from North Carolina State University. She went to PA school at University of Texas – Pan American where she graduated Magna cum Laude with a Bachelor of Science in Physician Assistant Studies. She then went on to receive her Master of Science in Physician Assistant Studies. Since graduation, Cassandra has worked in interventional cardiology, cardiothoracic surgery, clinical cardiology, and advanced heart failure and transplant cardiology. She is a member of the Central Texas Physician Assistant Society where she held the position of co-president from January 2013 to May 2017. She is a member of the Texas Academy of Physician Assistants, American Academy of Physician Assistants, and the Association of Physician Assistants in Cardiology.

Board Certification: Adult Gerontology Nurse Practitioner – American Academy of Nurse Practioners
Licensure: Adult Gerontology Nurse Practitioner with Prescriptive Authority – Texas Board of Nursing
Registered Nurse – Texas Board of Nursing
Education: Master of Science in Nursing – Maryville University, St Louis, Missouri.
BS in nursing – Bangalore University, India.

Mary Blackburn, APRN, AGCNS-BC
Mary Blackburn is a two-time graduate of The University of Texas at Austin, having obtained her Masters of Science in Nursing in 2000. She has worked in various fields in the medical profession, including heart transplant, telemetry/ICU/PACU, pain medicine, cardiac outpatient therapies, and post-acute/long term care. She has 2 children, in high school and college. She loves camping, outdoors, gardening, and spending time with friends.

Medical Education: BSN – All India Institute of Medical Sciences, New Delhi, India.
MSN – Texas Tech University Health Sciences Center School of Nursing,
Lubbock, Texas.
Licensure: RN – Texas Board of Nursing
APRN – Texas Board of Nursing
Certification: Family Nurse Practitioner – American Academy of Nurse Practitioners (AANP)

Stephen Berry, APRN, AGCNS-BC
Stephen earned his Masters degree as a Clinical Nurse Specialist from the University of Texas at Austin in 2021. He also holds a Batchelor’s degree in EMS management. Before becoming an Advanced Practice Nurse, he was a decorated US Army Medic, and spent many years working domestically and internationally teaching EMS and working as a Flight Nurse / Paramedic. He has a passion for teaching and enjoys seeing the light of comprehension in patients and students. He spends his spare time raising and taking care of animals on his farm.

Katherine Mayes, APRN, FNP-C

Emilie Boline, APRN, AGACNP-BC


President | Founder/Owner


Vice President of Operations