Whitney Johnson spent years as an investment analyst before applying the frameworks of disruptive innovation to personal career development. Her central tool is the S-curve of learning. The S-curve describes the pattern of growth in any new skill, role, or endeavour. At the bottom of the S, progress is slow and the work is frustrating: you are investing significant effort for minimal visible results because the fundamentals are not yet in place. This phase feels like failure even when it is normal. At the inflection point, the curve shifts steeply upward: the fundamentals have been internalised, momentum builds, and results compound rapidly. This is the most exhilarating phase: everything is working, confidence is high, and the growth feels effortless. At the top of the S, growth levels off: the learning is complete, the role has been mastered, and the challenge that was once stretching has become routine. This is the most dangerous phase. It feels good, but it is actually the moment when disrupting yourself, jumping to the base of a new curve, is most valuable and most uncomfortable. Most people resist jumping at the top of the curve because they have learned to confuse mastery with success. But mastery without challenge produces stagnation. The S-curve framework gives a language for recognising that feeling and a reason to act on it deliberately rather than waiting for external disruption to force the jump.