Matt Kelley, MPH


Matt is the Chief Executive Officer for the Montana Public Health Institute (MTPHI). In this role, he leads the strategic and programmatic work of the organization in order to build the institute into an effective and innovative partner in improving Montana’s public health system and the health and quality of life for all Montanans.

Matt’s interest in public health began in a small farming village in Mali, West Africa, where he served as a Peace Corps volunteer and worked with the community to provide food security, clean water, and improved health. That experience led Matt to a career in public health, including a tenure working on public health and mental health issues within the Executive Office of the Mayor of Washington DC under Mayor Adrian M. Fenty. More recently, Matt served for over 11 years as Health Officer of Gallatin County, Montana, where he led Gallatin City-County Health Department to national accreditation and helped establish new programs to address chronic disease, maternal and child health, and behavioral health and resiliency. Matt was Health Officer during the first 15 months of the COVID-19 pandemic and has served in board-level leadership roles for the Montana Association of Public Health Officials and the Greater Gallatin United Way.

Matt earned his MPH at Johns Hopkins Bloomberg School of Public Health, with an emphasis in Child & Maternal Health and Health Finance and Management. Prior to his career in public health, Matt was a journalist and newspaper reporter in Washington DC, where he covered Congress and issues affecting middle America. He is motivated by the promise and potential of the people who work within Montana’s public health system and a desire to empower and magnify the impact of their work.

Hillary Hanson, MS, MPH


Hillary is the Chief Operating Officer for the Montana Public Health Institute (MTPHI). In this role, she leads the development and implementation of all aspects of operations and provides leadership in developing, implementing, and evaluating programs and services that strengthen the public health system and optimize the health and quality of life of Montanans.

Hillary’s interest in public health began in the field of research but she quickly learned that public health in her home state of Montana was her true passion. Throughout her career in public health, Hillary has built strong, collaborative relationships with partners to address the social determinants of health and health equity. Her work is driven by a commitment to learning from and engaging with individuals and organizations serving the community.

Prior to joining MTPHI, Hillary served as the Health Officer of the Flathead City-County Health Department. She completed her MPH in Public Health Leadership at the University of North Carolina and an MS in Statistics from Purdue University. She has also served as a leader at both the state and national level through engagement with the Montana Public Health Association, the Association of Montana Public Health Officials, the National Association of County City Health Officials, and the Public Health Accreditation Board.

Holly Jordt, BSN, MPH


Holly is a Public Health Program Officer for the Montana Public Health Institute (MTPHI). In this role, she supports the development and implementation of MTPHI initiatives. Through building relationships and connecting public health professionals to resources, Holly works to address challenging health issues and empower local and tribal health departments to develop and implement prevention-focused and wellness-oriented services for all Montanans.

Holly has a passion for public health and prevention work. She enjoys working collaboratively to create systems change that will improve health outcomes for all. Holly is focused on health equity and ensuring that all individuals are represented in MTPHI initiatives.

Holly is a Registered Nurse and acquired her Master of Public Health from the University of Montana. She provided nursing care in the hospital setting prior to entering the field of public health. Holly has sixteen years of experience in local public health, working in the areas of maternal and child health, immunizations, reproductive health, behavioral health and addressing the social determinants of health. Holly joined MTPHI in November 2020.

Stefanie Tassaro



Stefanie joined the Montana Public Health Institute (MTPHI) in March 2022 as a Public Health Program Specialist and Administrative Coordinator. In this role, Stefanie provides organizational and programmatic support to the MTPHI team and the MTPHI’s initiatives. Stefanie is motivated by collaboration and continuous improvement and is excited to work towards improving Montana’s public health system.

Stefanie got her start in public health serving as an AmeriCorps VISTA with the Gallatin City-County Health Department. Upon completing her year of service with AmeriCorps, Stefanie served as the Accreditation Coordinator and Quality Improvement Specialist for the Gallatin City-County Health Department from September 2015 until December 2020. In this role, Stefanie led public health accreditation efforts, community health assessment and improvement planning, and organizational strategic planning and performance management. In addition to local health department experience, Stefanie has also worked at the Montana Department of Public Health & Human Services as the Accreditation Coordinator.

Stefanie earned a Bachelor of Science in Pharmaceutical Sciences from Purdue University and is currently enrolled in the University of Montana’s Master’s in Public Health program. Stefanie is also an active member in the Montana Public Health Association.