Mark Caldwell began his martial arts training in June 1982 under Roy Harrington at the Spokane YWCA. Mark was introduced to Lotus by his friend, James Harper. Starting in the summer before their freshman year of high school, Mark and James trained together both in class, and on their own time outside of class. Mark believes that having a training partner like this played a key part in shortening the length of time it took to attain the level of Black Belt.

On September 18, 1986, just two weeks before moving to Seattle to attend the University of Washington, Mark earned his 1st Degree Black Belt in a first-ever triple Black Belt Test. James Harper and Dave Kovac also each earned his 1st Degree Black Belt in that test.

Mark moved to Seattle at the end of September, 1986 to begin studies at the University of Washington. He was forced to suspend his martial arts training for several years while he finished school. After graduating from the UW's School of Business, Mark joined with Rob Taylor to open the Bothell, WA School of Lotus, at the Northshore YMCA. In the fashion of his instructor Roy Harrington, Mark led the students through intense workouts twice per week. Mark also offered private lessons to those students who wanted the extra teaching time. Out of this class came three black belts: Peggy Rahm (now 2nd degree), Billy Rahm, and Rob Taylor, Jr.

Since 1996, Mark has moved into doing more specialized, small group training, especially working with other Lotus Black Belts to keep their skills honed. Currently holding the rank of 3rd Degree Black Belt, Mark is a key liaison between the Seattle area students and the home school in Spokane. Mark has done short sets of additional training in Aikido and Jungyae Moosul in the Seattle area, as well as knife training under Master-at-Arms Bram Frank.