Becoming a millionaire at 25 didn't make me happy. Now, I invest in the health and happiness of my employees and myself.

Courtesy of Brandon Card Brandon Card worked at Big Tech companies and used his salary to invest in high-risk startups. Through those investments, he became a millionaire at 25. Now 38, he uses his net worth to prioritize mental and physical health. This as-told-to essay is based on a conversation with Brandon Card, founder and CEO of Terzo. It has been edited for length and clarity. In my 20s, I looked like a corporate guy through and through. I worked for Big Tech — Microsoft, Oracle, and…