In this interview, David Zierler, Oral Historian for AIP, Interview Allan Franklin, Professor Emeritus of Physics at the University of Colorado. Franklin recounts his childhood in Brooklyn and his decision to attend Columbia University as an undergraduate where he worked with Charlie Townes and Eugene Commins. He describes his decision to pursue graduate work at Cornell with Al Silverman, who at the time was working on photo production of pi-meson pairs, and his budding interest in the philosophy of science. Franklin discusses his post-doctoral research at the Princeton-Penn Accelerator and his career at the University of Colorado where, in the mid-1970s, he more fully focused on history of physics and philosophy of science matters. Franklin describes bubble and spark chambers, the significance of the Duhem-Quine problem, and his contributions on the Bayesian confirmation theory. In the last portion of the interview, Franklin discusses some of the philosophical issues surrounding the concept of a grand unified theory.