KELLNER, Mark David, 51, is safe in the arms of Jesus as of April 17, 2018. Mark is survived by his mother, Mary Kellner; sister, Sharon Kellner; and an extension of family and friends. Mark graduated from Hillsborough High School. He owned Sprinkler Repair Service for many years and loved what he did. Mark proudly serviced his country in the U.S. Air Force. He was a member of the Salvation Army Corps and enjoyed the many friendships formed there over the years. Mark was a loving and dedicated son and brother. He will be deeply missed.