Doing research on Lieutenant Colonel William Frederick Richard Hart-McHarg I happened on this site. Matt Barrett is a historian, animator and caricaturist who also maintains a blog specializing in the colonels of the Canadian Expeditionary Force. The site is well laid out and organized with a lot of content. Each colonel has a short biography with pertinent information and appropriate links.
Please take a look at Matt’s site. He has done a lot of fine work and it deserves our support.
Colonels with affiliation with the 18th Battalion Currently Available on Site
Lieutenant Colonel J. E. De Hertel
Lieutenant Colonel Thomas B. Welch
Lieutenant Colonel Ernest S. Wigle
Lieutenant Colonel C. M. R. Graham, D.S.O.
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History of the 18th Battalion CEF, "The Fighting Eighteenth" 
Thanks for the shout out!
My latest post is 18th Bn. commander G.F. Morrison. I couldn’t find a photo of him, so unfortunately no caricature for this one:
http://matthewkbarrett.com/2015/12/07/the-stock-broker/
Matt,
Found MORE information from your information. See my page for updated news story from Winnipeg Free Press. I also made a request on the CEF forum for a picture of Morrison.