Dennis Colleran Stats & Bio | Royals Pitcher

About Dennis Colleran

Dennis Colleran is a pitcher for the Kansas City Royals, wearing jersey number 78 and bringing a promising presence to the mound. Standing 6'3" and weighing 225 lbs, the right-hander possesses the physical tools that teams look for in a developing arm. Born on August 20, 2003, in North Attleboro, Massachusetts, Colleran grew up in the heart of New England before honing his craft at Northeastern University. His collegiate career helped shape the foundation of his professional development, allowing him to refine his mechanics and competitive instincts. Now with Kansas City, Colleran represents the next generation of talent the Royals are building around as the franchise looks toward a bright future. At just 21 years old, his best days on the mound are clearly still ahead of him.

Updated: Mar 9, 2026