Great leadership in a VUCA world of volatility, uncertainty, complexity and ambiguity resides in the constructive tension between healthy relationships and dynamic change. The word radical aptly describes a new style of leadership for a VUCA world because it captures this sense of constructive tension. The Latin origin of the word radical means "back to the roots" while in the modern vernacular, radical has come to mean out on the leading edge of change. The roots of great leadership is healthy relationships, but the fruit of great leadership is the ability to thrive in a rapidly changing world. If a leader is so focused on relationships that they let people stay in their comfort zones, or if they are so focused on change that they leave the team behind, the result in either case is organizational decay and decline. Servant Leadership is the right leadership philosophy for leading in the sweet spot of this constructive tension and 4th Dimension Leadership provides a practical strategy for creating aligned systems to make an authentic Servant Leadership culture both real and sustainable.