I am a PhD student in the Department of Earth and Environmental Sciences. I am broadly interested in rock magnetism and geophysical instrumentation. My current research focuses on speleothem magnetism and formation. I use lab-grown speleothem analogs to study magnetic remanence acquisition in actively crystallizing materials with the aim of furthering our understanding of paleointensity recorders. I also analyze natural speleothems using optical, magnetic, and electron microscopy techniques to determine environmental changes during hiatuses in growth. Research aside, I enjoy exploring the Twin Cities, doing crossword puzzles, baking, and spreading the word about lime cucumber Gatorade.
Publications & Presentations
Publications
Stine, J.M., Feinberg, J.M., Huttenlocker, A.K., Irmis, R.B., Ramirez, D., Doctor, R., McDaris, J., Henderson, C.H., Read, M.T., Shannon, K.B., Noren, A., O'Grady, R., Sloo, A., Steury, P., Fernandez, D.P., Henrici, A.C., and Tabor, N.J., In revision. Paleozoic Equatorial Records of Melting Ice Ages (PERMIA): Calibrating the Pace of Paleotropical Environmental and Ecological Change During Earth's Previous Icehouse.
Doctor, R., Feinberg, J.M. (2022). Differential thermal analysis using high temperature susceptibility instruments. Journal of Geophysical Research: Solid Earth, 127(7), e2021JB023789.
Cai, S., Doctor, R., Tauxe, L., Hendrickson, M., Hua, Q., Leroy, S., & Phon, K. (2021). Archaeomagnetic results from Cambodia in Southeast Asia: Evidence for possible low-latitude flux expulsion. Proceedings of the National Academy of Sciences, 118(11), e2022490118.
Selected Presentations
Doctor, R., Feinberg, J., Jaqueto, P. “The importance of clays in speleothem remanence acquisition” AGU Fall Meeting 2023
Doctor, R., Feinberg, J., Jaqueto, P. “Effect of field intensity on the remanence of speleothems” IRM Conference 2023
Doctor, R., Feinberg, J., Jaqueto, P. “The intensity of remanence in speleothems: Acquisition of magnetization in an actively crystallizing matrix” AGU Fall Meeting 2022
Jaqueto, P., Feinberg, J., Doctor, R., Cruz-Reyes, M., Penn, L., Lascu, I., Borlina, C., Lima, E., Strikis, N., Novello, V., Trindade, R., Cruz, F. “Aragonitic stalagmites record of the geomagnetic field: Paleomagnetic promise and limitations” AGU Fall Meeting 2022
Brown, M., Moskowitz, B., Feinberg, J., Bilardello, D., Solheid, P., Jaqueto, P., Jackson, M., Doctor, R., Hobart, K. “International Summer School for Rock Magnetism: Teaching Through Question-Driven Research” AGU Fall Meeting 2022
Teaching & Mentoring
Teaching Assistant, ESCI 2301 Mineralogy
Mentor of Undergraduate Researcher, Supervised research project of Kacie Malone, who won a UMN Undergraduate Research Opportunity Program (UROP) scholarship to study thermodynamic reactions of clay minerals.
Service & Outreach
Student Representative on the Executive Committee for AGU's Geomagnetism, Paleomagnetism, and Electromagnetism section (2023-present)
Advisory Board Member for AGU's Outstanding Student Presentation Award (2023-present)
ESCI Department Graduate Mentorship Program Coordinator and Mentor (2021-present)
Organizer of the UMN Earth Student Research Symposium (2020-22)
Member of Outreach Through Science and Art (OSA) at the University of Minnesota
Awards & Scholarships
Doctoral Dissertation Fellowship, University of Minnesota (2024-25)
ESCI Department Outstanding Teaching Award (2024)
Council of Graduate Students (COGS) Research Grant (2023)
Sawkins Community Fund (co-written) – ESCI Department (2023)
Outstanding Student Presentation Award – American Geophysical Union (AGU) Fall Meeting (2022)
National Speleological Society Ralph W. Stone Graduate Fellowship (2022)
ESCI Department Outstanding Teaching Award (2021)
Council of Graduate Students (COGS) Travel Grant (2021)