Though Alan Turing lived and was scientifically productive almost entirely in the first half of the 20th century, his concepts were far ahead of their time. His great and sweeping contributions to computing all occurred before 1950, yet their most profound and radical impacts are still to come. The full realization of Turing's genius likely awaits concrete embodiment in the computing and robotic artifacts of the 2020s and 2030s. By then, his concepts may finally be recognized as having been among the most powerful ideas in all of human history. They are very worth studying. If you can understand the basics, then you can know the future.