Yanni Partners will be acquired by insurance broker Arthur J. Gallagher, confirmed Marsha J. Akin, an AJG spokeswoman. The deal is expected to close before Jan. 31, and terms are not being disclosed. Yanni will be renamed GBS Investment Consulting. Operationally, there will be no change, said Theresa A. Scotti, Yanni Partners president; the firm will stay in Pittsburgh, and all employees will remain with the firm. Yanni Partners has been approached by potential acquirers many times since being founded in 1989, but principals were persuaded by AJGs offer because it allows the firm to continue to operate independently, Ms. Scotti said.