"When?" is the Most Important Question for Entrepreneurs. (The Answer: Now?) When do you launch? When do you act? When do you change? The cofounder of Square has answers.

By Jim McKelvey • Mar 5, 2020

Opinions expressed by Entrepreneur contributors are their own.

I am an entrepreneur, but I am also a glassblower, and every glassblower has a mentor.

In fact, we all have the same one: Lino Tagliapietra. Glassblowing is the only profession I know where everyone agrees on who the best practitioner is. Nobody knows who the best accountant or mortician or loan shark is, but the world's best glassblower is Lino.

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