| Ken Iverson (1920-2004) was one of the principal designers of APL and J. Here are a few photos of him from Cliff's archives. |  Ken at Kiln Farm with a prototype J Ultimate sportdisc (photo by Jana Michaud) |
 Ken with Donald McIntyre at the J User conference 2000 |
 Ken and Richard Brown work in the evening at the "J in the Math Classroom" workshop in June 1999 |
 Taking a break |
 Ken focused on his presentation at the workshop |