Gibson Sotheby’s International Realty has acquired Prudential Wilmot Whitney of Weston, marking its seventh acquisition in four years.

Peter and Barbara Casey started Prudential Wilmot Whitney in 1991 and have been servicing the Weston community for nearly 20 years, according to a statement.

"This is a company that fits our culture and our goal to offer the best service to our clients," said Larry Rideout, CEO and owner of Gibson Sotheby’s International Realty. "We have now acquired seven companies in four years – all during some of the most challenging economic times in history. Each of those acquisitions has made our company better, as we have enhanced their services to their clients."

Gibson Sotheby’s International Realty now has eight offices in and around Boston and nearly 200 agents. The firm had its highest sales volume in its 48 year history in 2010, according to a statement.