In Memoriam

Mark Stephen Geyer, 63, senior advisor to NASA’s associate administrator and former director of NASA Johnson Space Center (JSC), passed away on December 7, 2021, after an 18-month battle with pancreatic cancer. Born in Indianapolis, Indiana, Geyer earned both his Bachelor of Science and Master of Science degrees in Aeronautical and Astronautical Engineering from Purdue University. […]

Walter F. Huebner, world-renowned astrophysicist and planetary scientist specializing in comets, passed away peacefully at his home in Norman, Oklahoma, on June 1, 2021. Huebner received his Ph.D. in Physics from Yale University. After graduating, he worked at the Los Alamos National Laboratory from 1957 to 1987 in various capacities, from staff scientist to group leader. […]

Peter Signer, an eminent pioneer of noble gas geochemistry, died on December 10, 2021, following a lengthy illness. He was 92 years old. Signer graduated from the Physical Institute of the University of Bern under the directorship of Friedrich Houtermans. One of Signer’s pioneering studies was his first mass spectrometric investigation of the decay constant of lutetium-176. […]