Leaders from the Top 20 Firm talk about how its entrepreneurial, innovative culture drove it from humble beginnings to its current position as one of the most highly regarded in the profession. Current and past CEOs Matt Armanino and Andy Armanino, and the executive director emeritus of the Armanino Foundation, Mary Tressel share some of the elements of the firm's "secret sauce," as detailed in their recent book, "Empowered."