NASHVILLE, Tenn.--(BUSINESS WIRE)--G&A Partners announced today that it has acquired XMI, a Nashville-based provider of human resources and accounting services. XMI is the ninth acquisition G&A Partners has completed in the past three years. G&A Partners, a leading professional employer organization (PEO) and human resources outsourcing (HRO) provider, will use this opportunity to expand into the vibrant Tennessee market. The acquisition, which adds to G&A's current client base