Theodor Meyer-Lost pioneer of gas dynamics

Theodor Meyer's 1908 doctoral dissertation, with Ludwig Prandtl (1875-1953) as his advisor, introduced much of what has now become basic gas dynamics: not only the Prandtl-Meyer expansion but also the oblique-shock-wave theory as well. It is arguably the most influential dissertation in all of fluid dynamics. Yet no biography or even a photograph of Meyer has been available in the intervening century. This biography provides some insight into his character and covers his education, dissertation, World War I combat service and long career as an engineer and a teacher of math and physics.