A recent client published a brief description of a trek with Sammy on the Bradt website:
“He had thought through every detail of our trek and the experience from picking us up in Gondar to dropping us back at the Gondar airport was seamless”
Read more here: https://bradtethiopiaupdate.wordpress.com/2017/10/14/detailed-2017-trip-report/
Another article in a German newspaper also mentions Sammy:
https://www.welt.de/print/die_welt/reise/article170129422/Tipps-und-Informationen-Aethiopien.html