The Riverside Company, a private equity firm, completed the acquisition of a minority stake in G&A Partners, a human resources outsourcing services provider. Financial terms were not disclosed. “We are excited to partner with G&A, CEO John Allen, and the talented team of managers. During our partnership, we plan to expand offerings into other outsourced business services and extend G&A’s geographic footprint through both new office openings as well as acquisitions," George Cole, Riverside Managing Partner.