methodologist

method +‎ -ologist or methodology +‎ -ist

methodologist (plural methodologists)

1. A person who studies methodology, or applies its principles.
   • 2019, Tenko Raykov with George A. Marcoulides, “Thanks Coefficient Alpha, We Still Need You!”, in Educational and Psychological Measurement‎:

     Reliability, as a main index of measurement quality, has attracted an enormous amount of interest among methodologists and substantive researchers over the past century (e.g., McDonald, 1999).