Mr. John and Tri-Boro Trailer announced the promotion of Christopher McCarthy to president and Jeffrey Wolfarth to vice president as part of a leadership succession plan for the company. McCarthy joined Mr. John in April 2000 and most recently served as vice president. Wolfarth started with the company in 1977 and most recently served as general manager since 2000. Michael McCarthy, who has served as president since 2013, will move to the role of chairman.