bjarni valdimar tryggvason (september 21, 1945 – april 5, 2022) was an icelandic-born canadian engineer and a nrc/csa astronaut. he was a payload specialist on space shuttle mission sts-85 in 1997. it was a 12-day mission to study changes in the earth's atmosphere. tryggvason was born in reykjavík, iceland. he grew up in vancouver, british columbia.