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The 2021 Virtual Immunization Summit is an educational event targeting immunization leaders and healthcare providers from around the state and region who have an interest in addressing and improving immunization issues.

The Immunization Summit was approved for 6.5 hours of continuing education for physicians, nurses, pharmacists, and physician assistants. 

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The 2021 Immunization Summit can be viewed here:

 ImmunizeAR 2021 Immunization Virtual Summit 2021-11-05-08-59-28 (

*It may not start at the beginning so be sure to rewind it to the beginning of the video

Thank you to our platinum supporters
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Click these links to learn about resources at Arkansas Children's Hospital:

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Thank you to our bronze supporter
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Thank you to our Exhibitors

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Click these links to learn about resources available from GSK:

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Click these links to learn about resources available from SHARE:

Speaker Bios in Order of Appearance:

Jennifer Dillaha, MD

Since joining the Arkansas Department of Health in 2001, Jennifer Dillaha, M.D., has played a leading role in the Agency’s health promotion efforts, using a life stage approach that focuses on population-based interventions to improve the health and well-being of all Arkansans.

In August 2021, Dr. Dillaha was named the Chief Medical Officer. This is in addition to her role as Medical Director for Immunizations since November 2013 and the Medical Director for Outbreak Response since September 2019. Her charge in the role of Chief Medical Officer is to provide leadership and guidance for addressing Arkansas’s most pressing health problems, including COVID-19. She is uniquely prepared for that role as a physician with specialty training in internal medicine and subspecialty training in infectious diseases and in geriatric medicine.

Prior to her current roles, Dr. Dillaha served as the State Epidemiologist from March 2020 to August 2021,Special Advisor for Strategic Initiatives in the Office of the Director from June 2010 to April 2013, and Director of the Center for Health Advancement from August 2005 to June 2010 at the Arkansas Department of Health.

Creshelle R. Nash MD, MPH 

Dr. Creshelle R. Nash, M.D., M.P.H., is the medical director for Health Equity and Public Programs at Arkansas Blue Cross and Blue Shield. In this role, Dr. Nash provides leadership for developing, implementing, and evaluating health equity initiatives to help create a more inclusive and non-discriminatory healthcare system throughout Arkansas.

Dr. Nash provides oversight and guidance on public programs and products to improve health equity for all Arkansans. This role includes a position on the leadership committee for the Vaccinate the Natural State initiative, a combined effort from a diverse set of organizations working to increase the adoption of COVID-19 vaccines across Arkansas and ensure equitable access and distribution. Dr. Nash is passionate about addressing health disparities in Arkansas’ most vulnerable communities and takes action as a leader throughout the state.

In addition to her role at Arkansas Blue Cross, Dr. Nash serves as a consultant for Community Engagement and Social Determinants of Health and Equity at the University of Arkansas College of Public Health, where she is also the co-director of the Racial and Ethnic Health Disparities Service Learning Course.

Prior to her work with Arkansas Blue Cross, Dr. Nash served as the medical director for the Arkansas Minority Health Commission, where she developed and implemented community outreach programs and partnerships.

Dr. Nash completed medical school at the University of Maryland School of Medicine in Baltimore, MD, and served her residency in the Primary Care Internal Medicine Residency Training Program at George Washington University Hospital in Washington, DC. She received a Master of Public Health degree from Harvard University School of Public Health and completed a fellowship in Minority Health Policy from Harvard University School of Public Health, also in Washington, D.C.


Lydia Greene

Lydia Greene was an anti-vaxxer for 12 years and wrote a story on her journey to changing her mind, and bringing her 3 children up to date. She is now in nursing school to get into public health, to deal with vaccine hesitancy on the front lines. Lydia formed "Back to the Vax" with Heather Simpson to give other people like them support and a platform to share their experience if they choose to.


Heather Simpson

Heather Simpson is a mom who was popular in the anti-vax community as the mom who dressed as measles for Halloween, the least scary thing she could think of. She also made multiple viral anti-vax polls on Facebook. Heather formed "Back to the Vax" with Lydia Greene to give other people like them support and a platform to share their experience if they choose to.

Matt Coffield

Matt is the president of Coffield Capital Management in Little Rock, an investment advisory provider. Matt is married with two children Josh and Jake who attend the University of Arkansas, and Catholic High school in Little Rock. Matt was diagnosed with COVID in December of 2020 which led to two long months of recovery time and hospitalization.

LJ Tan, PhD

Prior to joining the Immunization Action Coalition (IAC), Dr. Tan was the director of medicine and public health at the American Medical Association (AMA) a position he held since 2008. From 1997 to2008, he was the AMA's director of infectious disease, immunology, and molecular medicine.

Dr. Tan was a voting member of the Department of Health and Human Services' National Vaccine Advisory Committee from 2009 to 2013, where he served on the adult immunization, vaccine safety, and healthcare worker immunization working groups, and chaired the immunization infrastructure working group. He also served for more than ten years as the AMA's liaison to the Centers for Disease Control and Prevention’s Advisory Committee on Immunization Practices, where he served on the influenza, pneumococcal, zoster, and adult immunization working groups.

He co-founded and currently co-chairs the National Adult and Influenza Immunization Summit. He continues to advise the ESWI Flu Summit and the APACI Flu Summit. He serves or has served on the steering committees/advisory boards of the 317 Coalition, the Adult Vaccine Access Coalition (AVAC), the Unity (United for Adolescent Vaccination) Consortium, the National Network for Immunization Information, and the National Viral Hepatitis Roundtable. Dr. Tan also serves, or has served on the National Quality Forum’s Adult Immunizations Expert Committee, the Pharmacy Quality Alliance’s Adult Immunization Working Group, and numerous national and international expert and technical advisory committees, including panels for the Centers for Medicare and Medicaid Services, The Joint Commission, and the Centers for Disease Control and Prevention, on issues ranging from vaccine hesitancy, to immunization quality measurement development, to adult immunizations, to immunization access and delivery. In 2007, he founded the National Immunization Congress and organized its 2007 and 2010meetings.

Dr. Tan is an editor for Vaccine, BMC Infectious Diseases, Medscape Infectious Diseases, and a member of the ESCMID Vaccine Study Group and has published more than 50 peer-reviewed articles.


William (Sam) Greenfield, MD

Dr. William Greenfield is a Professor of Obstetrics and Gynecology at the University of Arkansas for Medical Sciences and the current Medical Director for Family Health at the Arkansas Department of Health.

He received a Bachelor of Science in pharmacy from Auburn University, a Doctor of Medicine from Meharry Medical College, and completed a residency in Obstetrics and Gynecology at the University of Arkansas for Medical Sciences.

Notable professional achievements include expanding access to health care through the implementation of tele-colposcopy for the Arkansas Department of Health.

Since the onset of the pandemic, Dr. Greenfield has been actively engaged in community outreach and efforts to ensure health equity. He has served on the Governor’s Post Peak Task Force, as a member of the ADH Pandemic Physician’s Group, and as medical director of the ADH Quarantine Facility.

Dr. Greenfield is a dedicated professional focused on improving health care through clinical excellence, education, advocacy, and innovation.

He lives with his wife Tiffany and children Alexandria, Pearson, and Victoria in Little Rock, Arkansas.


Eric Crumbaugh, PharmD

Dr. Eric Crumbaugh graduated from the UAMS College of Pharmacy in May2008 and completed a community pharmacy practice residency with Kroger Pharmacy. Since then he has worked as a pharmacist and patient care specialist for Kroger, and an immunization grant coordinator at the Arkansas Pharmacists Association. Currently, he is the Director of Clinical Business Development for Express Rx. In this role, he assists their 30 pharmacies in incorporating clinical practices such as immunizations into their daily workflow to improve patients’ outcomes and better manage disease states.


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COVID-19 Vaccination - Jennifer Dillaha, MD

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Creating Vaccine Equity: COVID and Beyond - Creshelle Nash, MD

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From Anti-Vax to Pro-Vax - Stories from Two Advocates 

Lydia Greene and Heather Simpson

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COVID Survivor - Matt Coffield

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Will Influenza be Back? A Global Update and Strategies for Avoiding the "Twindemic" - L.J. Tan, MS, PhD

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COVID-19 Vaccine Considerations for Pregnancy - William Greenfield, MD

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How Pharmacies Become VFC Providers - Eric Crumbaugh, PharmD and Allie Staton, PharmD

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