Before joining American Express Global Business Travel (GBT), Evan Konwiser spent six years running two startups he co-founded.

“I know what it’s like to take a company from zero employees and get a company off the ground by building systems, building product, building your first customer base, raising capital, and manage capital in a business where you’re still burning cash,” he said.

The executive vice president of product and strategy uses the knowledge he gained then to help build teams and products at GBT today.

As part of a special series GBT is doing to help small- to medium-sized enterprises, Evan shares some of the top business tips he’s picked up over the years.

To find out where he thinks business owners should devote 90% of their time and how they can reduce their efforts elsewhere, read the full interview here.