In the early years of his medical career he served as an ophthalmic assistant at University College Hospital .
John Howard Cook was married to Ethel Maddox in 1898 and had three sons .
In the early years of John Howard Cook 's medical career John Howard Cook served as an ophthalmic assistant at University College Hospital .
John Howard Cook was married to Ethel Maddox in 1898 and had three sons .