DALLAS--(BUSINESS WIRE)--Ryan, a leading global tax services and software provider, has announced the acquisition of Marvin F. Poer and Company ("Poer"), the second-largest property tax consulting firm in the United States. Poer provides a full suite of property tax services for real, personal, and complex property clients. "The combination of the two largest and most prominent property tax practices in the United States cements Ryan as the leader in property tax consulting services across the