Meet John D. Rockefeller: Ledger A

The bookkeeper's religion

At sixteen, Rockefeller recorded every penny earned, spent, and given in 'Ledger A' — a book he kept like scripture all his life. Standard Oil was that ledger scaled: measure everything, waste nothing, compound relentlessly. He tithed from his first paycheck to his last.

The verdict

The Supreme Court broke up Standard Oil in 1911 — the monopoly's rebates and squeezed rivals were real, and history's verdict is fair. So is the other half: retail kerosene prices fell for decades, and his second act invented modern philanthropy — the University of Chicago, medical research that helped end hookworm and yellow fever.

Why they belong at your table

Seat him for discipline in the details: know your numbers cold, compound patiently — and hear firsthand what scale costs.