For Broadway, McKenzie co-produced three original plays including And Miss Reardon Drinks a Little starring Julie Harris and Estelle Parsons which opened on Feb 25, 1971.
[3] Written by Paul Zindel and directed by Melvin Bernhardt And Miss Reardon Drinks a Little received two Tony Award® nominations.
[4] McKenzie was ACT's chief administrator from 1969 to 1985, helping to steer the company through its precarious years under founder and general director William Ball.
It was said that McKenzie's practical instincts and placid good nature formed an essential counterweight to Ball's mercurial temperament.
Performers included Helen Hayes, Henry Fonda, Ethel Barrymore, Tyrone Power, Jessica Tandy, Gene Kelly and Tallulah Bankhead.
In 1978 Carroad sold the property to McKenzie, who maintained ownership until 1993, when the Peninsula Players Theatre Foundation purchased the theater.
McKenzie remained executive producer until his death in 2001 McKenzie was an active member of the League of American Theatres and Producers, vice president of the Council of Stock Theaters, president of the Council of Resident Summer Theaters, executive producer of the Connecticut Theater Foundation, a trustee of the Actors' Equity Association Pension and Health Fund, a member of the Association of Theatrical Press Agents and Managers, the Actors' Equity Association and the International Alliance of Theatrical Stage Employees.