Frank L. Lambert (July 10, 1918 – December 28, 2018) was an American academic who was Professor Emeritus of Chemistry at Occidental College, Los Angeles. He is known for his advocacy of changing the definition of thermodynamic entropy as "disorder" in US general chemistry texts to its replacement by viewing entropy as a measure of energy dispersal. He died in December 2018 at the age of 100. Teaching career Lambert graduated with honors from Harvard University with an AB, and received his doctorate (PhD) from the University of Chicago. After serving in the US Army in WWII and working briefly in industrial research and development, Lambert joined the faculty of Occidental College, teaching from 1948 to 1981. Lambert's primary concern was teaching. He advocated the abandonment of the standard lecture system, opting instead for a system more akin to a partnership with his students. Additionally, his research in the synthesis and polarography of organic halogen compounds was designed for undergraduate collaboration and all but one of his articles were published with student co-authors. After retiring from teaching in 1981, Lambert as a Professor emeritus, became the scientific advisor to the J. Paul Getty Museum, and then the principal Aide to the Scientific Research Director when the Getty Conservation Institute was established. Technical writings Lambert is known for his work on the energy dispersal model of entropy, publishing articles in the American Chemical Society's Journal of Chemical Education. After his initial 1999 article, "Shuffled Cards, Messy Desks, and Disorderly Dorm Rooms – Examples of Entropy Increase? Nonsense!", a second article completed his critique of the inadequacy of describing entropy in terms of "disorder". Then, in 2002 "Entropy Is Simple, Qualitatively" described the spontaneous increase in entropy as fundamentally due to the tendency of all types of energy to disperse in space, if they are not constrained – with molecular motion and energy content as the most important in chemistry. Further publications by Lambert and colleagues on the subject appeared through 2011. In 2004, Science noted the emphases of his articles and listed his major website. His ideas have been used by other authors in the Journal of Chemical Education. Lambert's ideas on entropy have been examined in a broad review of entropy by Jesper Haglund, Fredrik Jeppsson and Helge Strömdahl. Most notably, his work has influenced the way in which entropy (a concept defined mathematically in the technical literature) is presented