Kass will serve as an educational resource for adviser members, responsible for due diligence process and research on fixed-income products, the firm said.
RPAG said Kass has developed a valuable depth of experience at two prominent firms, Pacific Investment Management Company (PIMCO), and Western Asset Management Company.
Retirement Plan Advisory Group has 256 member firms, totaling 600 advisers in 46 states, and has $39 billion in assets under management.