Morris Tanenbaum grew up in Huntington, West Virginia, one of three children. His Jewish parents had come from Russia and Poland by way of Buenos Aires, Argentina; they owned a delicatessen, in which Morris worked after school. He liked and did well in school, always interested in science. A trip to the 1939 World's Fair further focused his interest in science. He graduated from high school and chose Johns Hopkins University because of its reputation for chemistry. He liked physical chemistry and physics and somehow found himself often being the business manager of college organizations. One of his professors, Clark Bricker, who was leaving for Princeton University, convinced Tanenbaum to accept a research assistantship there and to obtain a PhD. Tanenbaum worked on spectroscopy in Bricker's lab. He married Charlotte Silver whom he had met during his sophomore year at Johns Hopkins. For his thesis, he moved to Walter Kauzmann's lab to study the mechanical properties of metal single crystals; he won the DuPont and Proctor Fellowships. After being awarded his PhD, Tanenbaum went to work at Bell Laboratories where he did the original studies of single crystal III-V semiconductors. He was asked by William Shockley to head a group to determine if transistors could be made using silicon. Up to that time, all semiconductor technology had employed germanium where the transistor effect had first been discovered. Within a year, Tanenbaum, with the assistance of Ernest Buehler, made the world's first silicon transistor. A few months later, Gordon Teal at Texas Instruments made a similar transistor. Working with Calvin Fuller, Tanenbaum invented the diffused base silicon transistor using solid-state diffusion. When Shockley left Bell Labs, he invited Tanenbaum to join him to start up a silicon device company funded by Arnold Beckman. After much consideration, Tanenbaum decided to remain at Bell Labs and moved from semiconductors to the broader field of Metallurgy and Materials Science where he led a group including Gene Kunzler who invented high field superconducting magnets. He then moved from the Research Division of Bell Labs to the Electron Device Division where he directed the Laboratory responsible for the development of new devices other than semiconductors, such as solid-state lasers and magnetic memories. Western Electric recruited Tanenbaum to lead its new Engineering Research Center. He recruited PhD's in the physical sciences and engineering with an interest in applications for the manufacturing floor. He later became Vice President of Engineering for all of Western Electric and then moved from the technical side to become Vice President for Transmission Equipment with responsibility for the several plants that manufactured transmission equipment. Tanenbaum was called back to Bell Labs as Executive Vice President with responsibility for all of development. Then he moved to AT&T Corporate Offices as Senior Vice President of Engineering and Network Services. He later served as President of New Jersey Bell. In 1980, he was called back to AT&T as Executive Vice President for Administration. During that period, he was much involved in the Federal antitrust case against AT&T that was eventually settled by a Consent Degree that separated AT&T into several independent companies (the "Baby Bells") providing local telephone service and AT&T retaining Western Electric, most of Bell Labs, and the long distance services. As Tanenbaum says, that separation while maintaining quality telephone service was like trying to separate a Boeing 747 into two 737s while in flight. He became Chairman and CEO of AT&T Communications with responsibility for all long distance service. His final position was CFO and Vice Chairman of the AT&T Board of Directors. Recognizing that his position, though perhaps more exalted, no longer provided the "fun" he had always sought and found, he prepared to retire. He continued to serve as a Trustee at Johns Hopkins and MIT and on a number of corporate boards. After retirement he consulted for General Motors on their Board's Science Advisory Committee and served as the Vice President of the National Academy of Engineering and a member of the Governing Committee of the National Research Council of the National Academies. He and his wife have always loved classical music and he was a Founding Director of the New Jersey Performing Arts Center while his wife, Charlotte, served on the Board of the New Jersey Symphony. He also served on the Board of the New York Philharmonic. Throughout the interview Tanenbaum reflects on his enjoyment of his work; his interactions with his colleagues; his retrospective view of the history of transistors, semiconductors, and electronics; his fascination with and insistence on the importance of chemistry; and his long and deep association with AT&T in its various stages.