Distinguished for his fundamental researches on the Lower Palaeozoic stratigraphy of the Baltic Region and Australia, and for his contributions to the palaeozoology of the Lower Palaeozoic brachiopods, trilobites and ostracods. As palaeontologist to the Bureau of Mineral Resources he has added greatly to the precision of the geological mapping of Australia on the scale of 4 miles to 1 inch and to the knowledge of Australian stratigraphy.