Davidson is the author or co-author of several books on both using and writing software, including Learning Cocoa with Objective-C, Cocoa in a Nutshell, Running Mac OS X Panther, and Mac OS X Panther Hacks, all published by O’Reilly Media.

He also contributed to Agile Web Development with Rails, published by The Pragmatic Programmers.

Before he joined Shopify, he was a Principal Software Engineer and CTO in Residence at Microsoft for Startups.

In 2010, Duncan was the photographer for the Mission Blue Voyage in the Galapagos Islands and led the TEDxOilSpill Expedition in the Gulf of Mexico.

He was the co-founder and co-owner (along with Greg Koenig) of Luma Labs, a small company based in Portland, OR focused on making high quality camera accessories.