 Rasmussen was also among the founders of the Faroese Fishing Union () together with Símun Pauli úr Konoy in 1911, was the union's first secretary, and served as its director until 1947.Rasmussen published the first Faroese novel, "Babelstornið" (The Tower of Babel), in 1909.In 1910, he published the first Faroese botany textbook.