William W. Naismith
![William Naismith (right) and on the left, [[John MacKenzie (mountain guide)|John MacKenzie]], known as the UK's first professional mountain guide.](https://upload.wikimedia.org/wikipedia/commons/2/29/William_Naysmith_At_The_Foot_of_the_Pinnacle.jpg)
William Wilson Naismith (28 February 1856 – 27 September 1935) was a Scottish accountant and mountaineer. He was a key founder of the Scottish Mountaineering Club and created the eponymous Naismith's rule, used to determine the time necessary to walk a route with a given length and elevation gain.
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