Jason Fried is a founder and CEO of 37signals, a software company based in Chicago. Fried also treats 37signals as something of a laboratory for innovative workplace practices–such as a recent experiment in shortening the summer workweek to just four days. We caught up with Fried to learn how employees are like fossil fuels, how a business can be like a cancer, and how one of the entrepreneurs he admires most is his cleaning lady.

I’m a fan of growing slowly, carefully, methodically, of not getting big just for the sake of getting big. I think that rapid growth is typically of symptom of… there’s a sickness there.

I take my inspiration from small mom-and-pop businesses that have been around for a long time. There are restaurants all over the place that I like to go to that have been around a long time, 30 years or more, and thinking about that, that’s an incredible run. I don’t know what percentage of tech companies have been around 30 years. The other interesting thing about restaurants is you could have a dozen Italian restaurants in the city and they can all be successful. It’s not like in the tech world, where everyone wants to beat each other up, and there’s one winner. Those are the businesses I find interesting–it could be a dry cleaner, a restaurant, a clothing store. Actually, my cleaning lady, for example, she’s great.

I admire the way 37signals has grown organically, with a proper business model from day one, and without relying on venture capital. It is also responsible for Ruby on Rails.