Tom Esterbrook was one of L. Ron Hubbard's pen-names which he used in Scientology material. I was told of this fact some time in the 50's. He wrote some articles under that pen-name in Ability magazine of the 50's. Ability magazine in pdf format can be found at https://mega.co.nz/#F!IFJiXILR!H3Sf5AYblhBjmQ-3CJyuaw, though unfortunately they are not searchable.
You will find a list of Hubbard's pen-names at http://lrhpulps.weebly.com/l-ron-hubbard-pen-names.html
On the same site you will find names of a number of Hubbard's short stories together with a front cover of the magazine they occurred in at: http://lrhpulps.weebly.com/pulps.html (press the tab "Pulp" for menu of the different types of pulp magazines).