Gillette started in the early 1900s .
Gillette wrote and co-wrote more than a dozen books on topics ranging from rock excavation , to management and cost accounting , to his latest work in the 1930s on forecasting weather .
Starting in the early 1900s , Gillette wrote and co-wrote more than a dozen books on topics ranging from rock excavation , to management and cost accounting , to his latest work in the 1930s on forecasting weather .