Jim Tranquada is director of communications for Occidental College in Los Angeles. He is also a ukulele historian and enthusiast. Jim co-wrote, with John King, The ‘Ukulele: A History published by the University of Hawaii Press.
Jim is the great grandson of Augusto Dias (1842-1915) who was one of the pioneers of the ukulele.
You can read some of Jim’s papers here
There is an interesting interview with Jim on Ukulele Hunt which you can find here