Dr R. Todd Clancy is a Senior Research Scientist at SSI, which he joined as its first full-time research scientist in late 1994. He currently works as a remote SSI researcher from Bald Head Island, 3 miles off the southeast coast of North Carolina. Dr. Clancy is a specialist in remote sounding and radiative transfer retrievals of Mars, Venus and terrestrial atmospheric properties, ranging from dust and cloud aerosols to trace chemical species to dynamical state variables (such as temperature and winds). He has participated in Mars (Hubble Space Telescope, Mars Global Surveyor, and Mars Reconnaissance Orbiter), Venus (Pioneer Venus), and Earth (Solar Mesosphere Explorer) spacecraft investigations, and conducted ground-based microwave spectroscopy from ground-based observatories (the Very Large Array, Kitt Peak, and James Clerk Maxwell Telescope). Specific topics of study have included terrestrial photochemistry and stratospheric aerosols; Mars climate, clouds, and photochemistry; and Venus upper atmospheric photochemistry and circulation.