About GUSI

Global Ultrasound Institute (GUSI) is an online, longitudinal training platform for Point of Care Ultrasound (POCUS). Our mission is to equip front-line medical providers across specialties with high-yield, clinically-relevant POCUS skills. We offer ongoing training, evaluation, and mentorship to an expanding global community of practitioners and residencies.

Our years of experience as both practicing clinicians and expert educators make us uniquely positioned to guide your learning and increase your competency and confidence in POCUS. Whether you are an individual provider, part of a residency program, or a member of a larger health network, GUSI can provide you with the tools you need to take better care of patients.

Join us in our vision to build a community of confident and passionate POCUS practitioners who together will change the face of bedside medicine. 

Meet the Team


Kevin Bergman


Dr. Kevin Bergman is Co-Director of the Ultrasound and Global Health programs at the UCSF Contra Costa Family Medicine Residency, Associate Clinical Professor of the UCSF Department of Family and Community Medicine, and he is an attending physician at the emergency department at the Contra Costa county hospital. Dr. Bergman is a family physician and completed fellowships in emergency medicine and point-of-care ultrasound. He is passionate about teaching ultrasound to the next generation of physicians and has taught ultrasound to hundreds of residents and attending physicians around the world.

He is on the Board of Directors of the Society of Ultrasound in Medical Education, is an official consultant to the International Consensus Conference on Ultrasound in Medical Education, was the founding Vice-Chair of the American Association of Family Practice (AAFP) Ultrasound Member Interest Group, and co-wrote the POCUS guidelines for the AAFP. He won teaching awards both as a fellow and as an attending, and has taught ultrasound at WINFOCUS, AIUM/SUSME, AAFP, EM Essentials, and Society for Teachers in Family Medicine national meetings.

He also co-founded World Altering Medicine, a non-profit organization that provides medical and surgical care to rural patients in Malawi, where he has returned annually since his first visit in 2002.

Mena Ramos


Dr. Mena Ramos is co-founder of Global Ultrasound Institute (GUSI) and has taught point of care ultrasound to attending and resident physicians since finishing her residency in family medicine at the UCSF Contra Costa Family Medicine Residency in 2015.  As a UCSF Contra Costa Global Health fellow, she taught POCUS for family medicine faculty in Malawi and developed cardiac ultrasound curriculum for clinical officers. She is currently working as an attending physician at the Contra Costa Regional Medical Center emergency department.

As a POCUS advocate for family physicians and primary healthcare providers, Dr. Ramos co-wrote the POCUS guidelines for the American Association of Family Practice and was founding secretary of the AAFP POCUS Member Interest Group.  She has taught hundreds of residents and physicians at multiple national conferences including AIUM, ACP, AAFP, WIM and STFM. Dr. Ramos’ passion for teaching and POCUS have come together to create a POCUS experience that is engaging and accessible for providers around the world.



Matthew Fentress

Matthew Fentress, MD, DTM&H is a family physician at Contra Costa Regional Medical Center, Martinez, California. He completed a DTM&H at the London School of Hygiene and Tropical Medicine, and a Global Health Leadership Fellowship with Contra Costa Family Medicine Residency and Massachusetts General Hospital / Harvard Medical School. He has served with Médecins Sans Frontières, working with displaced populations in Myanmar and South Sudan, and with numerous other international organizations on projects in India, Liberia, Haiti, Kenya, Uganda, Malawi, and Tanzania. He has enjoyed teaching point-of-care ultrasound since 2011, has written book chapters and articles on the use of POCUS in resource-limited settings, and is currently conducting research in Peru to evaluate the utility of point-of-care lung ultrasound in the diagnosis of pulmonary tuberculosis.


Ryan Petering

Dr. Ryan Petering is an Associate Professor of Family Medicine at Oregon Health & Sciences University in Portland, OR.  He has trained at East Tennessee State University (MD and undergrad) and OHSU (Family Medicine residency and Sports Medicine fellowship).  He currently serves as Sports Medicine Fellowship Director and Sports Medicine Medical Director.  Musculoskeletal Ultrasound is a cornerstone of his academic career.  Specifically, musculoskeletal ultrasound curriculum development and practice implementation are focus areas.  This includes work locally in Portland, Oregon, at OHSU as well as regionally and nationally thru partnerships with GUSI, the American Medical Society of Sports Medicine (AMSSM), AAFP, OAFP, and STFM.   He teaches medical students, medical residents, fellows and attendings/faculty to use MSK ultrasound as a key part of medical decision making and practice.   He manages multiple CME courses thru OHSU, including hands-on scanning and use of cadavers to teach MSK diagnostic and therapeutic techniques.  Outside of work, Ryan and family spending time in the outdoors skiing, kayaking, surf-skiing, mountain biking and living the van life in his DIY sprinter van.


Ne (Melissa) Ferguson

Dr. Ferguson earned her medical degree from Loyola University Chicago Stritch School of Medicine and completed residency at the Contra Costa Family Medicine Residency Program in Martinez, CA as one of the chief residents. Subsequently Dr. Ferguson completed a Faculty Development Fellowship through the University of California at San Francisco and is currently one of the Core Faculty at Contra Costa Family Medicine Residency Program. She currently works as a hospitalist, primarily teaching the current family medicine residents. She teaches residents bedside procedures on the inpatient wards and in the ICU and has particular expertise in point-of-care ultrasound. She designed the point-of-care ultrasound curriculum for the inpatient faculty and residents at the Contra Costa Family Medicine Residency Program. She also teaches point of care ultrasound throughout the country and is currently the principal investigator for IRB-approved research in point-of-care ultrasound.


Opal Taylor

Opal Taylor, MD, MPH is an attending emergency medicine physician at Contra Costa Regional Medical Center in Martinez, California.  Dr. Taylor was born in Freetown, Sierra Leone and grew up in Dakar, Senegal, West Africa. She completed her residency training in emergency medicine and earned her Point of Care Ultrasound (POCUS) training certificate at Highland General Hospital, Alameda County Regional Medical Center, Oakland, California in 2008.  Prior to moving to California, she completed a Master’s of Public Health degree from The Johns Hopkins University School of Public Health, with a focus on Humanitarian Assistance and Refugee Studies. She earned her medical degree from Temple University School of Medicine in 2003. 

Dr. Taylor is passionately motivated to care for the underserved. This has led her to focus on point of care ultrasound (POCUS), which is an essential diagnostic tool that is widely available and portable to remote settings that are under-resourced and in disaster situations. She uses POCUS daily as part of her emergency medicine practice at the county hospital as well as internationally in medical mission trips to developing countries.  Dr. Taylor spent 6 weeks teaching ultrasound to medical providers on Congolese and Burundian refugee camps in Tanzania.  She subsequently volunteered with International Medical Corps in Haiti following the 2010 earthquake and had the first-hand experience of working in a disaster setting where POCUS was the principal imaging modality available in the tent hospital emergency department.


Jeff Pierce

Dr. Jeff Pierce is a family doctor who splits his time between teaching obstetrics at the UCSF Contra Costa Family Medicine Residency and teaching inpatient adult medicine at the Santa Rosa Family Medicine Residency. After completing his residency in 2007, Jeff spent an amazing year working with the Baylor Pediatric AIDS Corps in the southern African kingdom of Lesotho. From 2012-2014, he completed a fellowship in Global Health Leadership through Contra Costa Regional Medical Center and Massachusetts General Hospital. During this fellowship he focused on high risk and surgical obstetrics, as well as point-of-care ultrasound in resource-limited settings. He has worked in Latin America, Asia, and Africa off and on since 1997. Jeff has taught ultrasound to residents, staff physicians, medical students, clinical officers, and nurses around the United States and in sub-Saharan Africa since 2012.


Brandon Chase

Dr. Brandon Chase earned his medical degree at SUNY Upstate Medical University in Syracuse, NY, and completed his family medicine residency training at Cascades East Family Medicine in rural southern Oregon. After practicing full-scope family medicine at a nearby FQHC, he returned to Cascades East as core faculty in 2014 where, as faculty advisor of a resident-driven ultrasound interest group, he woke to the possibilities of POCUS. He considers himself fortunate to have learned just enough to teach POCUS at national conferences by AAFP, AIUM, STFM, and GUSI. His passion is using POCUS to expand quality and scope of care in office-based settings, though he is quick to reach for a probe when confronted with an admission for undifferentiated shortness-of-breath.


Daria Szkwarko

Daria Szkwarko, DO, MPH is an assistant professor in the Department of Family Medicine at Brown University. She did her FM residency at Brown and completed a preventive medicine fellowship and Masters in Public Health at the University of Massachusetts. She is the family medicine lead for the Academic Model Providing Access to Healthcare (AMPATH) consortium in Kenya and facilitates a bilateral educational exchange between North American FM trainees and Kenyan FM trainees at Moi University. Dr. Szkwarko is passionate about POCUS education and the expansion of this skill globally. She co-leads the point of care ultrasound (POCUS) curriculum at Brown University for the FM residency program, and she co-led the first POCUS workshop for FM physicians in Kenya in 2017 in collaboration with the Kenyan Association of Family Physicians which trained more than 90% of all FM physicians in the country.


Nicholas LeFevre

Dr. Nicholas LeFevre is a family physician and faculty at the John Peter Smith Family Medicine Residency and the TCU and UNTHSC School of Medicine in Fort Worth, Texas.  He completed a point of care ultrasound fellowship through the Ultrasound Leadership Academy and now directs the POCUS curriculum for JPS, the largest family medicine residency in the country with a focus on underserved rural, urban, and international medicine.  He helped write the AAFP POCUS Residency Curriculum Guideline, has authored textbook chapters on POCUS, and teaches ultrasound locally and nationally through AAFP and STFM.   He maintains a full-spectrum family medicine practice including inpatient, outpatient, and maternity care including high risk and surgical obstetrics, and is passionate about the use of POCUS in all of these settings to improve the quality of care we provide.


David Stromberg

Dr. Stromberg completed medical school at the University of New Mexico School of Medicine (UNM) in 2010 and residency training at Santa Rosa Family Medicine Residency Program in 2013. He is currently Core Faculty with the UNM Family Medicine Residency, Inpatient Education Director for the Family Medicine Residency and Director of the Feedback Initiative for the UNM School of Medicine. His passions include working with the underserved, full-spectrum family medicine, and reproductive health. He helped develop the POCUS curriculum for UNM Family Medicine Residents.  He has trained various UNM faculty on POCUS skills and teaching POCUS to learners.  He has integrated POCUS into his clinical work since 2016 and is a thrilled member of the GUSI team.  Outside of medicine he likes spending time with his family and being in the wilderness.


Kara Toles

Kara Toles, MD is an Assistant Clinical Professor of Emergency Medicine (EM) at The University of California, Davis School of Medicine and Director of Equity and Inclusion in the Department of EM. She is passionate about emergency medicine, POCUS, clinical education, and health equity. She honed her ultrasound skills in residency just across the bay in East Oakland at Highland Hospital, a historic Emergency Medicine program that is known nationally for creating excellent clinicians who are passionate about health equity. She holds a certificate in point-of-care ultrasound from Highland Hospital and the American Board of Emergency Medicine and has taught POCUS both nationally and internationally. She is excited to share the joys of POCUS with you.


Nelson Fundi

Nelson Fundi is a Medical Doctor specializing in the provision of Primary Care. Currently he is finalizing his residency in Family Medicine at the Aga Khan University in Nairobi, Kenya. He has a passion for POCUS having received training as part of the residency, attended workshops led by leading faculty from Contra Costa, and completed an elective at Contra Costa Regional Medical Centre certified by Global Ultrasound Institute (GUSI). Currently he serves as a volunteer POCUS trainer with the departments of Family Medicine and Emergency Medicine at the Aga Khan University-Nairobi and with the Emergency Medicine Kenya Foundation. His long-term goal is to be clinician-researcher participating in provision of both emergent and non- emergent care in which he firmly believes POCUS would play a key role especially in low resource settings.


Jason Reinking

Dr. Jason Reinking is the medical director for the TRUST clinic in Oakland, CA, a center for health care for the homeless brick and mortar clinic and street medicine programs. He graduated medical school at Loyola Chicago and encountered POCUS at Contra Costa Family Medicine Residency, honing its skills in its emergency room followed by a global health fellowship with a focus in ultrasound with PIH in Malawi. Driven by its usefulness in medicine for marginalized populations from the streets of Oakland to the hills of Malawi, Dr. Reinking is dedicated to bringing POCUS education to those that most benefit. He has presented on POCUS at international street medicine conferences, written textbook chapters on POCUS, and has taught courses from Anchorage to Nairobi.


Jason Yost

Dr. Jason Yost currently splits his time between the new family medicine residency program in Eureka and a small community ER in Arcata without specialty coverage. Point of care ultrasound is an integral component of Dr. Yost’s daily practice and he uses it in approximately 20-30% of his outpatient encounters (same for ED). In the outpatient setting, he is able to provide ultrasound-guided joint injections not otherwise available in his community. In addition, Dr. Yost’s POCUS skills allow him to make bedside diagnosis of DVTs, urinary retentions/hydronephrosis, pneumonia, as well as estimate ejection fractions. Due to extremely limited resources, outpatient ultrasound takes a month to be performed, which significantly compromises patient care. Given that, POCUS offers evidence-based tools to significantly shorten diagnosis and treatment time, decrease ER visits, and improve patient satisfaction.



Ari Eisen

Ari Eisen is the Communications Manager for GUSI. She has over five years of experience managing communications for several nonprofits in the Bay Area. Most recently, she served as the Program Director at Urban Adamah, an environmental education center in Berkeley. In addition to designing and producing programs at the intersection of environmental sustainability and health, Ari developed and managed the communications strategy for the organization. Ari is currently working towards her Master’s Degree as a student at the University of Pennsylvania’s Executive Program in Social Impact Strategy.


Elizabeth Sayre

Elizabeth Sayre is the GUSI Operations Manager.  Her professional background includes non-profit and arts administration, music performance, university teaching, advocacy for traditional artists, grant writing, arts philanthropy, interpretation/translation (Spanish and French), and organizing educational travel to Cuba for health professionals . She has researched and played Afro-Cuban music since 1992, and has authored 15 articles and co-authored a book chapter on traditional musicians and music. She studied graduate ethnomusicology at Wesleyan University, and holds an MA from the Graduate Program in Literature at Duke University, as well as dual Bachelors’ degrees from MIT in Chemical Engineering and Humanities.

advisory board

Advisory Board

Neil Jayasekera

Neil is a family physician who has dedicated his career to providing medical care to the underserved both nationally and internationally. He has provided full spectrum care in low resource settings and understands the utility and need for POCUS. Neil’s practice has included work in emergency medicine, obstetrics, ambulatory care, inpatient, rural, and disaster medicine. In 2011, as a core faculty member at Contra Costa Family Medicine Residency, he created a global health fellowship and one of the first POCUS curriculum training programs in Family Medicine. He is proud that graduates of Contra Costa have become recognized leaders in POCUS education. He has taught POCUS to thousands of providers and has been the principal organizer of POCUS workshops at AAFP, CAFP, STFM, Contra Costa, and other family medicine residency programs in the United States and abroad. Neil is the primary author and editor of the American Academy of Family Physicians Point of Care Ultrasound Curriculum Guidelines and has co-authored multiple articles on the use of POCUS in Primary Care and Global Health.