Dr. Jack Holt joined the LPL faculty as Professor in April as part of the Earth Dynamics Observatory cluster hire, with a secondary appointment in the Department of Geosciences. He received his Ph.D. from Caltech in 1997, was a postdoctoral scholar at JPL, and then spent nearly 20 years at the University of Texas at Austin, where he was most recently a Research Professor at the Institute for Geophysics and the Department of Geological Sciences. He studies ice in the solar system with an emphasis on Mars and Earth. He is a Co-Investigator on the SHARAD radar sounder instrument on the Mars Reconnaissance Orbiter, conducts airborne geophysical studies of Alaskan glaciers as part of NASA’s Operation IceBridge, and has worked extensively in Antarctica. Jack is currently developing new radar sounder techniques and conducting geophysical studies of terrestrial debris-covered glaciers as Mars analogs. The Earth Dynamics Observatory is a collaboration across departments (and even colleges) at UA designed to complement the excellence in upward-looking science established by LPL and Steward Observatory with a downward-looking view of Earth as a planet.