Jonas S. Johansson, an emeritus associate professor of anesthesiology and critical care in the Perelman School of Medicine, died on March 10. He was 64. 

Born in Zug, Switzerland, Dr. Johansson spent his childhood in England, Sweden, and Brazil before enrolling at the University of Miami. There, he studied medicine and pharmacology, earning a BS in 1984 and an MD and PhD in 1990. He then completed his training in anesthesiology at Penn, then joined Penn’s faculty in 1994 as an assistant professor in anesthesiology. 

In 2003, he advanced to associate professor, a role he held until his retirement and assumption of emeritus status in 2024. Throughout his career at Penn, he published research papers on the pharmacology of anesthetics and taught multiple generations of future anesthesiologists.

Dr. Johansson is survived by his son, Erik (Kathryn); his grandsons, Oliver and Grady; and his brother and sister, Tomas and Lottie (Roland).

In lieu of flowers, contributions can be made to the Arbor Day Foundation in his name, in accordance with his love of nature and trees.