Andrew Hayes's Introduction to Mediation, Moderation, and Conditional Process Analysis text has become a staple in social science graduate education. The third edition came out recently, and this project is based on the second edition, from 2018. All three editions of his text have been from a frequentist OLS perspective. This project is an effort to connect his work with the Bayesian paradigm. Herein I refit his models with my favorite R package for Bayesian regression, Bürkner's brms use the packages from the tidyverse to visualization and data manipulation.