The phrase "professional historians" refers to experts who study and write about the past as their main job. They are trained in research methods and use evidence to understand and interpret historical events. Full definition
This is an expensive but magnificent set of volumes written by a team of professional historians whose research began in 1986. (totalpolitics.com)
Their meetings are occasions when professional historians from both traditions associate freely, sharing with each other information about the past. (religion-online.org)
It is disappointing to see professional historians reduce the complexity to a black and white affair where it goes without saying what the preferred colour is. (judithcurry.com)