One of Dr. Albrecht's dental assistants told the dentist he should buy a machine that would sterilize his tools without using any water because water tends to cause the tools to rust or corrode over time. Dr. Albrecht, who runs a solo practice in a small rural town, located some articles on the chemical sterilizer and read about how the machine works. After gathering more information and talking to salespeople, Dr. Albrecht placed his order for the machine. In terms of the buying center, Dr. Albrecht had the role of **blank**.
initiator agent influencer liaison