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William H. Mann is a Grammy-nominated American songwriter, record producer and founder of independent music publishing company Green & Bloom/Topline, as well as chairman of management firm Manncom. In 2021, alongside partner Benton James, he launched Proof Of Concept, a talent development and creative media services firm. Later that same year, in partnership with Warner Music Group’s ADA Worldwide, Mann and James announced the launch of joint venture label, icons+giants. Wikipedia