David A. Johnston

David Alexander Johnston (December 18, 1949 – May 18, 1980) was an American USGS volcanologist. He was killed by the 1980 eruption of Mount St. Helens in Washington. He was a principal scientist on the USGS monitoring team, 
Johnston was killed in the eruption while observing the post away on the morning of May 18, 1980. He was the first to report the eruption, transmitting "Vancouver! Vancouver! This is it!" before he was swept away by a lateral blast.