Karikó was hired by the University of Pennsylvania in 1989 as an adjunct professor and researcher, where she met and began collaborating with Weissman, a professor of medicine at Penn, in 1997.

They spent the next 20-plus years collaborating, "figuring out how to get it to work, how to get a vaccine to function well," Weissman, still a professor at Penn, said in a Monday news conference.

Penn's Drew Weissman, Katalin Karikó win Nobel Prize for creation of mRNA vaccines against COVID-19 02:38. PHILADELPHIA (CBS/AP) -- Two scientists, part of the University of Pennsylvania's ...

Penn Medicine researchers Katalin Karikó and Drew Weissman were named winners of the 2023 Nobel Prize in Medicine on Monday. Karikó , an adjunct professor of neurosurgery at the Perelman School of ...