CNBC's Jim Cramer reflects on Apple CEO Tim Cook's legacy building the "greatest consumer-based enterprise in history."

Tim Cook's 15-year tenure at the helm of Apple was highly profitable for Wall Street, as the company's market cap swelled from $350 billion to $4 trillion.

Cramer isn't alone in his optimism: several Wall Street firms issued positive notes after the succession announcement.

CNBC's Jim Cramer reflects on Apple CEO Tim Cook's legacy building the "greatest consumer-based enterprise in history."

"[Tim] Cook is one of the best listeners I've ever encountered," says Kim Scott, author of "Radical Candor" who was a faculty member at Apple University.