As a child, Joe Brennan dreamed of becoming a marine biologist, but when a post-college stint as a paralegal at Mayer Brown instead convinced him to attend law school, it appeared that his love of science would remain a personal interest, not a professional calling. Little did he know that, more than a decade later, he would find a job that combined those two passions.

Upon graduating from school, Brennan worked as a litigator, but he found the idea of in-house work more appealing. With only two years of legal experience under his belt, however, he found it difficult to make the transition to corporate law, so he bolstered his business knowledge by taking a job in the City of Chicago’s contracts and commercial law division.