Johannes Gad

Johannes Wilhelm Gad (30 June 1842 – 1926) was a German neurophysiologist who was a native of Posen.

In 1895 he succeeded Ewald Hering (1834–1918) as manager of the department of physiology at the University of Prague.

He performed numerous investigations involving electrophysiology, spinal cord functionality, the relationship between lactic acid to muscle contraction, et al. With Edward Flatau (1868–1932), he conducted experiments that were critical of Bastian-Bruns Law in regards to the loss of function following spinal cord injury.

Among his written works was a textbook on human physiology that he co-authored with pharmacologist Jean-François Heymans, called Kurzes Lehrbuch der Physiologie des Menschen, and a treatise on skin sensation that he published with Alfred Goldscheider (1858–1935), titled Ueber die Summation von Hautreizen.

In 1887, with Sigmund Exner, he founded the periodical Centralblatt für Physiologie.