Joachim Heinrich Seelig (29 March 1942 – 15 August 2024) was a German and Swiss[1] physical chemist and specialist in NMR Spectroscopy.

In 1968 he graduated with a doctorate under the guidance of Manfred Eigen at the Max Planck Institute for Biophysical Chemistry in Göttingen.

In 1970 he moved as a postdoc to the Institute of Physical Chemistry at the University of Basel where he became a group leader and assistant professor in 1972.

[6] Joachim Seelig developed biophysical methods for studying the structure and thermodynamic properties of biological cell membranes.

[7] He investigated the interactions of proteins and lipids by EPR-spectroscopy, deuterium and phosphorus nuclear magnetic resonance, neutron diffraction and calorimetric methods.