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He worked for NASA Goddard Space Flight Center for 36 years, beginning in 1968 and retiring in 2004. He was the head of the Astrochemistry branch for 14 years and through the publication of over 100 peer-reviewed papers, his research directly benefited NASA's Upper Atmosphere Program and the Planetary Atmospheres Program. Many of his studies provided the first experimental measurements of rate constants, product yields, and branching patterns. These laboratory results have aided in the understanding of observations from Voyager; Galileo, Cassini, and other spacecraft as well as ground-based telescopes. His dedication and service played a key role in the many successful programs and activities of NASA's Goddard Space Flight Center.

Lou is survived by his son, Andrew Stief (and Michelle) of Germantown, MD; his daughter, Lorraine Brush (and John) of New Meadows, ID; his sisters Germaine O’Hara of East Norriton, PA, and Helene Stout of San Juan Capistrano, CA; and many nieces, nephews, cousins, other relatives and friends.

He was preceded in death by his ex-wife, Kathleen Talbot Stief and his brother, John “Jack” Stief.

Lou enjoyed living in River Park in Southwest D.C. as well as classical music, fine dining and wine. He also enjoyed the arts, especially attending events at The Kennedy Center and Arena Stage with his many friends in Washington, D.C. He enjoyed traveling to the U.K. to see friends and relatives, tea and everything British, especially British TV shows.

Prior to his death, he fought Parkinson’s Disease for many years while continuing to live a very productive and enjoyable life.