Upon conclusion of his collegiate studies, he returned full time to Muller Pipe Organ Company and was instrumental in moving the company toward major restoration projects and new instrument construction.
Today Mark oversees sales from his office in the Toledo area and provides tuning and maintenance services in northwest Ohio, Michigan, and Indiana.
In his free time, Mark continues his lifelong work with the poor and marginalized; he counts time spent working in rural Appalachia as life-defining. He also enjoys spending time with his children and grandchildren and taking long walks with his wife.