Retirees who exhaust their savings while still alive are said to experience financial ruin. The savings are typically grown during life’s accumulation phase then spent during the retirement decumulation phase. Extensive research into invest-and-harvest decumulation strategies has been conducted, but recommendations differ markedly. This has likely been a source of concern and confusion for the retiree. Our goal is to find what has heretofore been elusive, namely an optimal decumulation strategy. Optimality implies that no alternate strategy exists or can be constructed that delivers a lower probability of ruin, given a fixed inflation-adjusted withdrawal rate. * The author is a consultant statistical programmer and studies in the Department of Systems Engineering at Stevens Institute of Technology. All appendices referred to in the text can be found in the Internet Appendix document that accompanies this research.