Rudolf Steiner, Renaissance Man of the 21st Century
In terms of productive offering to the world, spiritual scientist, Rudolf Steiner, is the best-kept secret of the 20th Century. Although he passed on in 1925, what he gave to the world is even now just gaining momentum. The answers and resolutions to the issues of humanity that he brought comprise futuristic material - they actually apply more to the 21st Century, and beyond.
Some of the resolutions Steiner generated:
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Three-Fold Social Order - transcending capitalism and socialism
An Overview of Spiritual Evolution of Humanity
Anthroposophy - knowledge of the nature of humanity