When mentioning the author of a journal I am using in my Literature Review, should I mention author's credentials? In my Literature Review, I mention the authors of the published papers I use and the results found in their study. My question is whether I should reference the author's credentials alongside the field in which they belong to or is this unnecessary?

Ex.1 (With)
"Joakim Ruist, a researcher in the department of economics at Gothenburg University, studied the effects of refugees on public finance, finding similar results."

Ex.1 (Without)
"Joakim Ruist studied the effects of refugees on public finances, finding similar results."

Ex. 2 (With)
"In contrast to the conclusions drawn by Ruist, Alden and Hammarstedt, and Storesletten, Bo Rothstein, Professor in Political Science at University of Gothenburg, argues the sustainability of the Swedish welfare state is not under threat by refuge migration."

Ex. 2 (Without)
"In contrast to the conclusions drawn by Ruist, Alden and Hammarstedt, and Storesletten, Bo Rothstein argues the sustainability of the Swedish welfare state is not under threat by refuge migration."
What matters is the work presented in the paper. So you just write


  Ruist [1] studied the effects of refugees on public finance, finding similar results.