The world of SEO is full of sharp minds, fierce opinions, and tactics that work: until they don't. The Opportunity + Authority framework is a diagnostic tool: it helps you decide whether your real leverage point is visibility and relevance (Opportunity) or credibility and trust (Authority).
Below are fifteen practitioners whose work has shaped how SEO is thought about and done. Each profile maps their core ideas onto the O+A framework: what they help you discover, what they help you build, and which side of the equation they push hardest on.
This isn't a ranked list. It's a directory of perspectives. Pick the ones whose problem looks most like yours.