Callum focuses his practice on commercial litigation. He has experience litigating cases in both state and federal court covering various types of business related claims. Callum is responsive to his clients' needs and finds practical solutions for their most puzzling challenges. 

Prior to joining Dinsmore, Callum spent four years as a law clerk for Judge Thomas M. Rose of the Federal District Court for the Southern District of Ohio. In this role, he advised the Judge on every aspect of complex civil and criminal matters, including multiple jury trials.