Alexander Mackenzie

Sir Alexander Mackenzie (or MacKenzie, Scottish Gaelic: Alasdair MacCoinnich; 1764 – 12 March 1820) was a Scottish explorer known for accomplishing the first east to west crossing of America north of Mexico in 1793, which preceded the more famous Lewis and Clark Expedition by 12 years. The Mackenzie River is named after him, the longest river system in Canada and the second longest in North America.