Lang was capped by Scotland twice, in the period 1876 to 1877.[6]
Family
He was the son of Robert Howard Lang and Jane Reid. He had brothers James, Howard and Robert; sisters Helen, Mary, Jane; and a half-sister Isabella. He married Margaret Galt and they had 5 children: Robert, John, Jean, David and Helen.[7]
Outside of rugby union
He became a dyer of fabrics in Paisley's cotton trade.[7]
Emigration
He emigrated to the United States and became a naturalised citizen in 1917 in Suffolk, New York.[8]