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David A. Knowles is an experienced engineer and owner of Knowlesound LLC, a recording and mastering studio established in December 2011. With a strong background in audio engineering, David has provided engineering support for CBS News since 1986 and has served as a tech specialist and engineer for CBS 3 - KYW TV Philadelphia since 1985. Prior experience includes engineering work at Visual Sound Company from 1970 to 1982, focusing on audio visual system design and installation. David holds an associate degree in Applied Engineering Technologies from Delaware County Community College, completed between 1970 and 1973.