In Memoriam: John D.C. Little

John Dutton Conant Little, MIT Institute Professor and the Professor of Management Science at the MIT Sloan School of Management, died in the early morning hours of September 27, 2024. He was 96 years old. We will miss him dearly, but will forever be enriched by all that he created and shared.

John was a giant in two academic fields: operations research (O.R.) and marketing science. During his nearly seven-decade academic career, John made significant contributions to queueing theory, traffic flow management, branch-and-bound optimization, decision support systems, O.R. and marketing science.

John arrived at MIT in the summer of 1945 and completed his Bachelor of Science in Physics in three years. After a year working as an engineer at GE, John returned to MIT to pursue his Ph.D. in physics. Although his coursework and exams were indeed in physics, during his program, John’s research interests gravitated toward the fledgling field of O.R., a shift that was facilitated by a research assistant position with Professor Philip Morse, considered the founder of O.R. in the United States. John’s O.R. dissertation explored water-flow management in a hydroelectric reservoir and dam system. With the help of Whirlwind I, one of the first real-time digital computers of any type, which lived at MIT, the result was a 4,000-line program that modeled and optimized a hydroelectric water dam’s water use. John was the first person to ever earn a Ph.D. in O.R.

John spent the first five years of his academic career at the Case Institute of Technology (now known as Case Western Reserve University) in Cleveland, Ohio, after which he landed an untenured associate professor of operations research and management position at the MIT School of Industrial Management (now known as the MIT Sloan School). MIT would remain John’s academic home until his retirement in 2017.

In the O.R. world, John is best known for his eponymous Little’s Law, a mathematical queuing theory that states that the average number of customers in the queuing system over time (L) equals the average arrival rate of customers to the system (λ), multiplied by the average time each customer spends waiting in the system (W). Little’s Law, or L= λ W, can be used to identify bottlenecks in production and service systems, and other areas involving queuing.

Little’s Law in no way captures the breadth of John’s achievements in and contributions to both academia and industry. In the field of marketing science, of which John is considered a founder, his published works span a wide array of modeling and decision support issues such as individual choice behavior, adaptive control of promotional spending and marketing mix models for consumer-packaged goods.

John first began working with industry on O.R.-related marketing projects during his early days in academia. One of these projects involved helping M&M Candies solve an advertising allocation dilemma. Another project, with Cummins Engine, involved solving a sales support conflict between the engine manufacturer and its independent distributors. Through a project with Nabisco, in which John was asked to create a model to help set advertising levels for Oreo cookies, he determined that in order for managers to use models, they needed to understand them so that they could control them. A seminal paper, “Models and managers: The concept of a decision calculus,” soon followed. Continuing his research and work with industry, John co-founded Management Decision Systems, a marketing models software company that was later purchased by Information Resources, Inc., on whose board John served. It was these hands-on experiences that led John to develop the O.R. in Marketing graduate course.

John held many leadership roles throughout his career at MIT. He was director of the MIT Operations Research Center. At the MIT Sloan School of Management, he served as head of the Management Science Area and head of the Behavioral and Policy Sciences Area. Also at MIT Sloan, he was chair/co-chair of the Undergraduate Program Committee for 20 years.

Outside of MIT, John served as president of both ORSA and TIMS, and, after helping facilitate their merger, he became the combined organization’s (INFORMS) first president.

John was the recipient of numerous awards and honors. He was elected to the National Academy of Engineering. From the American Marketing Association, he received a Charles Parlin Award for his contributions to the practice of marketing research as well as the Paul D. Converse Award for lifetime achievement. He was awarded the Kimball Medal of ORSA and the Distinguished Service Medal of TIMS. In 1989, MIT named John an Institute Professor, the highest title given to faculty.

John was predeceased by his wife Elizabeth, whom he met at GE in 1951 and also began a Ph.D. program at MIT in physics the same year as John, and by his two sisters. He is survived by four children, eight grandchildren and two great-grandchildren.

A longer tribute to John and his many achievements and contributions will appear in an upcoming issue of OR/MS Today.