Henry Lee Jackson (January 11, 1956 – November 11, 2014), known by his stage name Big Bank Hank, was an American hip hop recording artist and manager.

Also known as Imp the Dimp, he was a member of the trio the Sugarhill Gang, the first hip hop act to have a hit with the cross-over single "Rapper's Delight" on the pop charts in 1979.

Unable to attain a position in oceanography, he worked the doors of a Bronx nightclub called The Sparkle, where he became a music manager for Grandmaster Caz and his group the Mighty Force MC's.

While managing for a local hip hop group, the Mighty Force MC's (including Grandmaster Caz), Jackson was discovered by Sylvia Robinson.

She was out trying to find an act for the new hip-hop trend she had discovered through her son and she heard Jackson rapping some of Grandmaster Caz's rhymes by chance when she visited Crispy Crust Pizza in Englewood.