Hollenback was the head college football coach for the Franklin & Marshall Diplomats located in Lancaster, Pennsylvania. He held that position for the 1908 and 1909 seasons.His coaching record at Franklin & Marshall was 13 wins, 7 losses and 1 tie.As of the conclusion of the 2010 season, this ranks him #11 at Franklin & Marshall in total wins and #9 at the school in winning percentage ().