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Al Barlett is a retired Professor of Physics. He joined the faculty of the University of Colorado in Boulder in September, 1950. His B.A. degree in physics is from Colgate University and his M.A. and Ph.D. degrees in physics are from Harvard University. In 1978 he was national president of the American Association of Physics Teachers. He is a Fellow of the American Physical Society and of the American Association for the Advancement of Science. In the late 1950s Al was an initiator of the citizens' effort to preserve open space in Boulder, and this ultimately led to the establishment of the City of Boulder's Open Space Program which by 1999 had purchased over 26,000 acres of land to be preserved as public open space. He is the founding member of PLAN-Boulder County, an environmental group for the City and County. Since the late 1960s he has concetrated on public education on the problems relating to and originating from population growth. More recently he has written on sustainability, examining the widespread misuse of the term, and examining hte conditions that are necessary and sufficient for sustainability in any society. Since 1969 he has given his lecture, "Arithmetic, Population, and Energy" over 1500 times to audiences of all levels from coast to coast.