Has anyone met these sailors?

I've been searching for information about my great-grandfather and a great uncle for some time with only minimal success. Petter Martin Knudsen was born 7/14/1853 at Hidra (Vest-Agder), a navigator by trade who wound up in Brooklyn, NY by the mid-1880's to take on-shore work as a cable splicer for a street railway and on construction of the Brooklyn Bridge. He died in Manhattan around 1895. Andreas Andreassen was born in 1875 at Åkerøya (Aust-Agder), a carpenter and later an upholsterer by trade. A friend on ÅAkerøya told me that Andreas made more than 40 crossings to the States, refusing to fly after the Norwegian American Line went out of business. He worked for a time as an upholsterer at the Waldorf-Astoria Hotel in New York. He died in 1979 and had wintered on Åkerøya until he was 100. If anyone recalls hearing their names mentioned by a family member who might have encountered either of them at sea or elsewhere, I'd be very grateful for any anecdotes you might have to share. Thanks, JK