Tony
I've got some realtively detailed information on the golfing emigrants from Carnoustie in the 1898-1914 period, and the number is in excess of 150, just from that little town. Most of them became professoinals, which in those days included club making and greenkeeping, and they practiced the latter at hundreds of courses, as most of them moved around frequently in those years, as well as some having both summer and winter clubs. Bob S. Simpson (not THE Robert Simpson), for example, emigrated in 1899, starting at the Oconomowoc CC in WI, moving to Riverside CC IL in the mid-1900's; then to CC Of Memphis in 1906. He left that job after the following incident:
"It appears he was coaching Mrs. Joseph Skinner, a reputed beauty, and on her invitation at the close of the round proceded to the clubhouse for lunch. While the couple were sitting on the verandah, Mrs. Skinner's husband appeared on the scene and, producing a revolver, fired point blank at the pair. Mrs. Skinner stepped between Mr. Simpson and her husand, and receiving the shots in her own body was killed."
He moved to Blue Mound CC, WI for two years and then in 1910 to Kenosha for the highest salary paid to a pro at that time. Worked as head pro at Coronado CC, CA for a long time, and after that club was made NLE in WWII ended up his years living in the back of his shop at a driving range in 1945.
Somehow, I think that guys like this knew their biology/agronomy as well as their golf......