It's important to note here that even though Jim Walker was a great pioneer and promoter of our sport and should always be held in extremely high esteem for his myriad contributions, it is a matter of fact that the legally recognized and documented inventor of CL was Oba St.Clair.
You can read about Oba, and Jim in the wonderful book that Jim Lee mentioned that was authored by Charles Mackey. I was most honored to be asked to write the forward for that book by Charles.
Bob Hunt