Landis Zimmerman is the managing partner of Zimmerman Oliver-Cletrac, a successful business that supplies parts and services to Oliver-Cletrac users world-wide. Based in Ephrata, Pennsylvania, Landis (aka "Mr. Cletrac") is one of the leading authorities on the Cletrac and Oliver line of crawlers. Landis also has a unique collection of crawlers including a rare experimental X12, a Cletrac 55, A Cockshutt OC-4 and a pair of Cletrac F models as well as several others.