Seems like the so called Lisp hackers are Common Lisp users. Before Matlab was cool, Lisp is VERY maths-heavy and engineering-heavy. Symbolic equation solvers,

Seems like the so called Lisp hackers are Common Lisp users. Before Matlab was cool, Lisp is VERY maths-heavy and engineering-heavy. Symbolic equation solvers, robot controls, neural nets, etc. Even Julia which is very Matlab-like has roots to Lisp.