Susan Hou, M.D. - Founder

mommugSusan is a nephrologist based in River Forest, Illinois and is Professor of Medicine at Loyola University Medical Center in Maywood, Illinois. She is the major funder of the Clinic as well as one of its part time doctors. The commute from the U.S. is a killer, but Susan makes it as often as she can. Susan received her M.D. degree from the University of Massachusetts in 1975 and did her internship, residency and renal fellowship at New England Medical Center in Boston.

Mark Molitch, M.D. - Founder

dadmugMark is an endocrinologist also based in River Forest, Illinois and is Professor of Medicine at Northwestern University in Chicago, Illinois. He is our other major funder of the Clinic and a part time doctor as well. He makes the commute from the U.S. with Susan and occasionally combines the trip with trips to other parts of South America to fulfill his responsibilities as a highly sought after lecturer. Mark received his M.D. degree from the University of Pennsylvania. He did his internship and residency at The Hospital of the University of Pennsylvania and his endocrine fellowship at the UCLA-Harbor General Hospital.

Douglas Villarroel, M.D. - Founder

doogsmugDouglas is an endocrinologist from Santa Cruz, Bolivia and in 2003 is serving as President of the Bolivian Endocrine Society. He provides ongoing health care for the people that come to the clinic, as well as providing the clinic with on-site direction so that it can continue to serve the people. Douglas studied at Universidad Mayor, Real y Pontificia de San Francisco Xavier de Chuguisaca in Sucre, Bolivia. He did his fellowships in Internal Medicine and Endocrinology at Centro Medico Nacional Siglo XXI in Mexico D.F., Mexico.

Carlos Vargas, M.D. - Clinic Director

DrVargas Carlos Vargas Moreira and is one of the general physicians at CMHP. He went to primary school in his local community in Bolivia and then continued on to medical school at Mayor de San Simon in Cochabamba, Bolivia. In addition to working at CMHP, he also work in the public hospital in Portachuelo. His greatest desire is that people, especially those with little money, receive his help and his dedication to better their health conditions and that they always have balanced health that allows them to live longer.  He has recently taken over the Clinic Director.  He overseas the patient care at the clinic, supervises the residents and medical students and helps teach the Health Promoters.

Maria Cespedes, R.N. - Nurse

mariamugMaria is at the clinic throughout the week to provide basic health care when the doctors aren't available. Maria's abilities surprise us every day. So far Maria has casted legs, stitched up cuts, intubated patients, and provided emergency care in the back of a pickup when a car crashed nearby. Maria also teaches many classes at the clinic. She is training our Nurses' Aides as well as providing classes on Basic Health. She helps patients manage their illnesses, such as providing diabetic patients with information on how to control their carbohydrate intake.

Sarah Goldberg - North American Coordinator

bydavidSarah served as a clinic coordinator at CMHP in 2010 and her experience there solidified her decision to work in healthcare and serve others. As the North American Coordinator, she prepares new volunteers for their trip, helps organize fundraisers and apply for donations, keeps an inventory of donated medications and keeps things organized for the DHF in general.

Andrea Escobar - Clinic Coordinator

andreaAndrea is a coordinator at Centro Medico Humberto Parra and a 2020 M.D. candidate at Loyola University Chicago Stritch School of Medicine. She is originally from Corona, California, completed her Bachelor of Science in Public Health with a concentration in International Health at Johns Hopkins University, and received her Master of Science in Medical Sciences at Boston University School of Medicine. Andrea is enjoying learning from her colleagues at CMHP and from the patients that live in the surrounding communities that are seen by clinic. She is looking forward to continuing to foster strong relationships between these communities and the clinic, as well as working with patients to improve their health.

Megha Srivastava- - Clinic Coordinator

MeghaMegha is one of CMHP’s 2018-2019 clinic coordinators and a 2020 MD candidate at Loyola University Chicago Stritch School of Medicine. Originally from the Chicago suburbs, Megha completed a Dual Degree in Medical Anthropology and Nutrition from Case Western Reserve University in 2014. Megha has an ever-growing commitment to global health and social justice, after field experience locally in Cleveland and Chicago as well as abroad in Guatemala, India, and Ecuador. Megha is looking forward to a year of growth, learning and service with her new CMHP family, community members, and patients.

Greer Madole - Clinic Coordinator

GreerGreer is a coordinator at Centro Medico Humberto Parra who also goes by Gabi at the clinic. She graduated from Loyola Chicago's Marcella Niehoff School of Nursing in May 2018 and became a registered nurse in June 2018. She is originally from Kansas City and has family on the East Coast as well. She is passionate about global health care and is appreciative of the opportunity to work at the clinic.

Ana Rocio Loza Ramallo - Social Worker

anaI am Ana Rocio Loza Ramallo – licensed in social work. I started to work at CMHP December 10, 2011, attending to patients that come from the different communities. I orient them and help them to navigate through consults outside of the clinic. I think fondly of all of my patients and greatly enjoy helping them.

Jaqueline Sandoval - Nurse

vickiJaqueline is a nurse working at CMHP. She was born in the town of San Carlos June 20, 1982. At the age of 8 she moved to Palacios and when she was 12 she went to Santa Cruz to study. It was there that she met her husband and was married. She then returned to live in Palacios with her husband and her two kids. She studied nursing in Buena Vista and worked with CMHP voluntarily as a Health Promoter in the community for 7 years. Right now she is finishing her nursing internship through Ceteex, with her thesis focusing on malaria.

She started working full time at CMHP in 2012 to help out while Guinda was on maternity leave and in February 2013 she began working in the lab.

Juan Carlos Carmona Nina

JuanJuan Carlos is the biochemist in charge of labs run at CMHP. He graduated high school at Porroguial San Jose and continued his training in university at Universidad UDabol where he graduated with a degree in Bioquimia y Farmoa in 2012. He lives in Portachuelo and also works at Hospital Municipal N.D.A. while not at CMHP.

Francisca Escobar Barrientos – Pharmacy Tech


Francisca Escobar Barrientos has been at Centro Medico Humberto Parra since 2013. She lives in Palacios with her son and daughter. She works in the clinic pharmacy, keeping track of and organizes all of the medicine that comes in, distributes patient prescriptions, and ensures that the clinic has a sufficient supply of necessary medications.  She enjoys interacting with the patients on a daily basis, and helping out in any way she can. 

Alejandro Guerrero, M.D. - Staff Physician

GuerreroMy name is Alejandro Guerrero. I was born in Cochabamba, Bolivia. I studied in both Cochabamba and Santa Cruz. I have been a doctor for about 8 years and I have worked in Palacios since the year 2005. Since 2005, I have also work in the Hospital Nicolas Ortiz in Portachuelo and Clinica Vidal in the city of Montero. I enjoy the work in Palacios as we work together as a team with the North American Volunteers who day to day bring their support and experience. They are more than coworkers, they are great friends and a big family.

I think that everyone who comes to clinic to get medical attention deserves our full effort and they leave comforted by the work we have done. We know this is true when we see a smile at the alleviation of their problems and the bettering of their quality of life. The time is short to achieve the objectives that a person strives for, but its never too late to try to achieve your goals.  Taking this into account, I try to follow the road that god as placed before me to continue my daily work and achieve happiness. 

Ana Paula Sousa – M.D., Staff Physician


Ana Paula Sousa has been coming to the clinic as one of the general physicians since March of 2017. Born and raised in Brazil, Ana Paula moved to Bolivia to complete her medical education at UDABOL in Portachuelo. She would say that she really enjoys collaborating with everyone at the clinic, and enjoys the atmosphere and speaking with patients, basically everything! She hopes to continue working at the clinic for a long time to come. 

Adolfo (Pepe) Ribera - Care Taker

PepeMy name is Adolfo (Pepe) Ribera and I’m from Palacios, Bolivia. I work to take care of the clinic for half of the week and have done so for the past 5 years. In the same year I started, I planted coffee seeds. Finally, we are now harvesting and roasting the beans at the clinic. I like working in the clinic to help those that work hard there. In the afternoons, when the volunteers and doctors finish with the patient, I join them in playing sports such as futbol, futbol tenis, voley, basket y Mario kart. Also, I prepare the horses for people to ride. I am also in charge of cutting the grass and fixing things in the clinic when necessary. I also enjoy helping my wife, Mumi, with all of her work. 

Teresa (Mumi) Oliva Arauz - House Mom

MumiI’m Teresa (Mumi) Oliva Arauz. I was born and raised in Palacios. I went to Santa Cruz when I was 13 to work and study. When I was 17, I returned to Palacios and married Pepe. Now I have 8 kids and I pass them the best I can – all of my children have finished high school and now they are studying and working to become professionals.

In 2001 I was working as the president of the school and met Dr. Douglas when we were dancing at the inauguration for the clinic. In January 2002 I met Maria Cespedes and started to work as a volunteer preparing lunch for the doctors and cleaning the clinic. 3 years later, I was employed by the clinic 4 days a week. In 2002, with Maria, we organized the first group of patients from the community of Palacios and I am the president of the group. Now I work cooking lunch for the volunteers and the doctors and I do the cleaning of the whole house and clinic. From 2003-2005 I was elected the mayor of Palacios. In December 2013, I will receive my high school diploma and plan to continue to study cooking. I am very interested in healthy cooking and I enjoy making healthy and delicious meals for everyone.