This timeline is the result of more than three decades of research and personal collaboration with Ken Wilber. While it incorporates information from published books, interviews, journals, correspondence, and archival materials, many chronological details were verified directly with Wilber himself. During the years we worked together, I was able to ask him about the timing, sequence, and context of significant events in his life and work, allowing numerous details to be confirmed that are not available in published sources. Although Ken generally had little interest in reconstructing his past, he generously answered questions when they served the historical record. This timeline preserves that unique body of firsthand information.