He emigrated from England. His name was found on the Enoch Train ship manifest with Alice and Ann Leisley. His name does not appear on the typed index, but if you open Alice's link to the ship and click on the photograph of the original ship manifest, you will see his name directly below Alice and Ann's.
Thomas married Ann upon arrival to Utah. They are located together on the 1860 Utah census, along with Alice. His surname is written "Seney" in census records.