Growing up in Northern Michigan, Angus began playing rugby in High School with the Traverse City Alliance. In College, Angus attended Davenport University where, as Captain, he lead the Panthers to back to back D1 AA National Championships in 2011 and 2012. He earned All-American honors in College and was also a part of the USA U20’s team that won the World Rugby U20 Trophy, a tournament held at Murray Park, Utah back in the summer of 2012. In 2014 MacLellan was called up to the USA Selects for the Americas Rugby Championship and made his USA Eagles debut in April 2016 against Italy. Angus is engaged and has a daughter.