Cliff Asness doesn’t have the name recognition of a Warren Buffett or a Carl Icahn. But among “quant” investors, his words carry a lot more weight.

Asness is the billionaire co-founder of AQR Capital Management and a pioneer in liquid alternatives. For all of us looking to build that proverbial better mousetrap, Asness is our guru. My own Peak Profits strategy, which combines value and momentum investing, was inspired by some of Asness’ early work.

Unfortunately, he’s been getting his butt kicked lately. His hedge funds have had a rough 2018, which prompted him to write a really insightful and introspective client letter earlier this month titled “Liquid Alt Ragnarok.”

“This is one of those notes,” Asness starts with his characteristic bluntness. “You know, from an investment manager who has recently been doing crappy.”

Rather make excuses for a lousy quarter (Asness is above that), he uses his bad streak to get back to the basics of why he invests the way he does.

As I mentioned, Asness specializes in liquid alternatives. In plain English, he builds portfolios that aren’t tightly correlated to the S&P 500. They’re designed to generate respectable returns whether the market goes up, down or sideways.

You don’t have to be bearish on stocks to see the value of alts. As Asness explains,

You do not want a liquid alt because you’re bearish on stocks or, more generally, traditional assets. That kind of timing is difficult to do well. Plus, if you’re convinced traditional assets are going to plummet, you want to be short, not “alternative.” In other words, liquid alts are a “diversifier” not a “hedge.”

You should invest [in a liquid alt] because you believe that it has a positive expected return and provides diversification versus everything else you’re doing. It’s the same reason an all-stock investor can build a better portfolio by adding some bonds, and an all-bond investor can build a better portfolio by adding some stocks.