Tómas's parents were Steinunn Þorsteinsdóttir and Guðmundur Ögmundsson, living at Efri-Brú in Grímsnes.
During that time he got in touch with even more authors, including Jón Thoroddsen junior.
After his graduation he opened an office to practise law and in 1928 he started working at Hagstofa Íslands.
A statue of Tómas by the sculptor Halla Gunnarsdóttir was unveiled in 2010 at the southern end of the Tjörnin, a lake in Reykjavík centrum.
The first three books he published, Við sundin blá, Fagra veröld and Stjörnur vorsins belong to neoromanticism and so do his last two books, Fljótið helga and Heim til þín, Ísland, but its signs are not as strong.