If you need the to his free PDFs or spreadsheets, let me know, and I’ll point you to the official source.
Here’s the concise story:
It sounds like you're referring to the well-known story behind , specifically his PDFs.
Aswath Damodaran is a professor of finance at NYU Stern, often called the "Dean of Valuation." For decades, he has taught valuation to both MBAs and the wider world.