Marissa attended the University of Nebraska-Lincoln and completed her Bachelor of Science degree in 2015. She graduated with distinction from Union College, receiving her degree in Master of Physician Assistant Studies, in 2018. She is certified by the National Commission on Certification of Physician Assistants. She is a member of the Nebraska Academy of Physician Assistants and the American Academy of Physician Assistants. She joined Gastroenterology Specialties in July 2018.
Providers > Physicians
- Clark W. Antonson, M.D., FACG
- Erik A. Bowman, M.D.
- Andrew D. Coen , M.D.
- Mark G. Griffin, M.D.
- Matthew J. Hrnicek, M.D.
- Sally A.I. Knooihuizen, MD
- William J. Lawton, M.D.
- David P. Newton, M.D.
- Paul F. Petersen, M.D.
- Christopher C. Rife, M.D.
- James W. Roat, MD
- Michael P. Roth, M.D.
- R. James Sorrell, M.D.
- J. Reggie Thomas, D.O.
- Laura M. Vance, D.O.
- Mark A. Wells, MD
Providers > Advanced Practice Providers
- Jill Beisel, PA-C
- Lisa Donner, APRN
- Claire Elliott, PA-C
- Amanda Hall, APRN
- Cynthia Hammond, APRN, DNP
- Kim Hiser, APRN, DNP
- Rebecca Jurgens, APRN, DNP
- Nicole Keedy, APRN
- Alexandra Johnson, PA-C
- Amy McCracken, APRN, DNP
- Stephanie Millington, APRN
- Samantha Nice, APRN
- Marissa Sjoberg, PA-C
- Jelayna Stauffer, APRN
- Erin Zimmerman, PA-C
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