Dr. Eifler joined Steward Observatory in August 2018. Tim's research expertise includes areas of modeling cosmological observables, in particular weak lensing, galaxy clustering, magnification, and cross-probes of the aforementioned. His second main research area is on statistical tools and their application to big astronomical data sets. Tim has worked on methods of data compression, optimally extracting cosmological information, estimation of covariances, and improving the current state of the art parameter estimation process. He is deeply involed in the Large Synoptic Survey Telescope Dark Energy Science collaboration and in the Dark Energy Survey, where he leads the analysis team on developing the multi-probe inference pipeline. He is a Co-I on the Wide Field Infrared Survey Telescope's Science Investigation Team on weak lensing, galaxy clusters and galaxy clustering and leads the effort on forecasting and optimizing corresponding aspects of the WFIRST mission. Tim is also involved in an ongoing weak lensing superpressure balloon mission that aims to obtain space quality imaging in optical bands at a fraction of the costs of a satellite mission. Tim got his "Diplom" in Physics from the University of Bonn, Germany, in 2005 and his PhD in Astronomy from the same University in 2009 on "Theoretical Aspects of Cosmic Shear and its Ability to constrain Cosmological Parameters" supervised by Profs Peter Schneider (Bonn) and Yannick Mellier (Institute d'Astrophysique de Paris). He moved to Ohio State University as a CCAPP-fellow in 2009 and to a second postdoc at the University of Pennsylvania (2012-2014), before accepting a staff scientist position in the Astrophysics and Space Sciences section at NASA's Jet Propulsion Laboratory.