Early in his career, Rosenberg began playing for the
Transvaal provincial team. Picked five times for the
South Africa national rugby union team between 1955 and 1958, in which he scored two tries, Rosenberg moved to the United Kingdom and changed codes to become a professional rugby league player while studying dentistry at
Leeds University. He made 81 appearances for Leeds, scoring 73 tries. After retiring from rugby, Rosenberg returned to South Africa, where he established his own dental practice before a stroke ended his dental career in 1970. After this, Rosenberg turned his hand to other pursuits, including boxing promotion. ==Personal life==