The message of music mogul Russell Simmons’ latest book, “Super Rich: A Guide to Having It All” (Gotham), may seem contradictory: A person can become “super rich” by reaching the state of needing nothing.

Simmons, the self-made millionaire often credited for putting hip-hop on the map with Def Jam Recordings, is one of the wealthiest black Americans in the country, but he argues a person can become rich not by obsessing about money but by giving to others.

Being rich is about finding the happiness inside, he says.

Slender and with a kind smile, the 53-year-old still looks youthful, part of what he attributes to a strict …