Angela Duckworth
Angela Duckworth is a psychologist best known for the concept of grit: passion and perseverance sustained over very long-term goals. In this wiki, she matters because she adds a motivational layer to the learning cluster, especially where ability, persistence, and time horizon interact.
In grit-the-power-of-passion-and-perseverance, Duckworth's distinctive move is to say that success often depends less on raw intelligence than on whether people can keep going through boredom, difficulty, and slow compounding. She also provides an important bridge to growth mindset, which she treats as one of the strongest current candidates for helping people become grittier.