Mercer advises institutions with more than $16 trillion in assets. Here's what its top investment strategist is telling the world's biggest investors.

• Mercer advises institutions with more than $16 trillion in assets.
• Rich Nuzum is the firm's global chief investment strategist, counseling the largest investors in the world.
• He spoke to Business Insider about what is top of mind for these allocators.

Rich Nuzum is Mercer's global chief investment strategist, advising institutional investors with more than $16 trillion in assets (yes, trillions with a "T") on where to put money, what to be worried about, and who to trust with their precious capital.

He spoke to Business Insider about the private credit boom, evaluating asset managers, and being ready for the next crisis. This interview has been edited for brevity and clarity.