Morgan Stanley has a history of languages in the vein. MS was a big APL shop in the 80s. Arthur Whitney[1] worked at MS and developed the languages A, and A+. He later wrote J, and K.
I think J was mainly written by Roger Hui (now @ Dyalog APL) after Ken Iverson designed it himself. I think Roger was inspired by Whitney though...or was Whitney actually involved?
[1] https://en.wikipedia.org/wiki/Arthur_Whitney_(computer_scien...