Fritiof Stig Sjöstrand (5 November 1912 – 6 April 2011)[1] was a Swedish physician and histologist born in Stockholm.

Manne Siegbahn at the Nobel Institute for Physics had planned to build an electron microscope in Sweden, and Sjöstrand got involved in the project to explore its use in medical research.

In 1947-1948, he received a scholarship to further study electron microscopy at Massachusetts Institute of Technology's Department of Biology.

Back in Sweden, he received funding to build up an electron microscopy research laboratory.

[5] A holder of the lectureship also spends time with students and postdocs at SciLifeLab.