I enjoyed the coauthored tactic puzzle book of his Sharpen Your Tactics. One of the better of the types.
Before he quit smoking Lein was a chain smoker and I was watching him at a tournament standing with his hands clasped behind his back, holding a cigarette and tap, tap, tapping the lit end with his index finger. Seemed like a difficult trick.
great story. did he do engineering work in the US? Chess is a tough way to make a living.
Not sure. I seem to remember hearing that when he emigrated here (New Jersey first, later Cleveland) he had to promise he would not work in any scientific profession. As far as I know he played in tournaments and gave lessons out of his home. I think his wife whom he met in Cleveland was an attorney.