A historian and author who co-originated the generational theory with Neil Howe, laying the foundational framework that Howe extends in his analysis of recurring historical cycles.

The 16th president of the United States, exemplifying leadership during the Civil War, a Fourth Turning period, characterized by national redefinition and shared sacrifice.

The 32nd president of the United States, serving as a model of Crisis leadership during the Great Depression-WWII era and illustrating the transition from institutional breakdown to societal renewal.

An Arab historian whose early theories of cyclical state formation and social cohesion provide historical grounding for the generational model.

A British historian whose analysis of recurring patterns in history supports the concept of generational cycles as a framework for understanding periodic crises.

An American political scientist whose empirical work on the periodicity of war and generational replacement lends support to the generational theory.

An American historian known for his theory of recurring political cycles, which aligns with the generational model’s depiction of alternating periods of public purpose and private interest.

A political scientist whose research on declining social capital in the US provides empirical evidence of the societal conditions preceding a generational Crisis.