Jamie Wellerstein is a fictional character from the musical The Last Five Years, created by Jason Robert Brown. He is a young, ambitious writer who navigates the complexities of love and career as he experiences a relationship with his wife, Cathy Hiatt. In the musical, Jamie's story is told in a non-linear fashion, showcasing his perspective in chronological order while Cathy’s story unfolds in reverse. This unique storytelling highlights the contrasts in their experiences and emotions, ultimately revealing the challenges they face in their marriage.