Albert Grossman became Dylan's manager on August 20, 1962. Since Dylan was under twenty-one when he had signed his contract with CBS, Grossman argued that the contract was invalid and had to be re-negotiated. Instead, Hammond responded by inviting Dylan to his office and persuading him to sign a "reaffirment"—agreeing to abide by the original contract. This effectively neutralized Grossman's strategy, and led to some animosity between Grossman and Hammond. Grossman enjoyed a reputation in the folk scene of being commercially aggressive, generating more income and defending his clients' interests more fiercely than "the nicer, more amateurish managers in the Village". Dylan critic Andy Gill has suggested that Grossman encouraged Dylan to become more reclusive and aloof, even paranoid.