Photo by Travis David | Surrounded by her family, Sullivan senior Parker Mischler signed her National Letter of Intent on Friday to continue her academic and volleyball playing career to DePaul University.

BY TRAVIS DAVID [email protected]   SULLIVAN — At an early age, Parker Mischler once spent part of her Christmas Day in the gym working on her volleyball skills.   That same work ethic has only increased over the years. In turn, all the countless hours in the gym and dedication…