Dr. Egami's main research area is extragalactic astronomy with a special emphasis on ground/space infrared/submm observations. His current research interests include, (1) galaxies in the reionization era (z>6), (2) infrared-luminous galaxies both at high redshift and in the local Universe, and (3) cluster galaxy evolution and cooling flows. In recent years, he has particularly been interested in using massive clusters of galaxies as cosmic telescopes, exploiting their gravitational lensing power to observe faint background galaxies that would otherwise be unobservable. As the principal investigator, he is currently leading several large international space observing programs, such as "The Herschel Lensing Survey" (Herschel Key Program: 292.3 hours) and "The IRAC Lensing Survey: Achieving JWST Depth with Spitzer" (Spitzer Exploration Science Program: 526.4 hours).