Fonds documents Martin Parker's work as the Regional Coordinator of the Parry Sound District for the second edition of the Atlas of the Breeding Birds of Ontario (also known as the Ontario Breeding Bird Atlas), an inventory of breeding bird species compiled between 2001 and 2005 that was intended to aid conservation efforts in Ontario. Fonds documents Parker’s responsibilities as Regional Coordinator including the recruitment, training, and organizing of atlassers (volunteer bird watchers), and the compilation of the data they collected. It also contains observational data from the Nipissing District, which it appears he was also involved in overseeing. The fonds also documents Parker's contributions as an author of several species accounts for the atlas.

Fonds is arranged into one series containing breeding bird observation data, as well as other files and items that do not belong to any series.