He also made significant contributions supporting the arts, impacting the careers of Robert S. Duncanson, Hiram Powers, and others.

[2] Early in his career he accepted plots of land as payment, which increased in value as Cincinnati grew, and by 1818 he quit being a lawyer to manage his real estate holdings.

[3] Believing Cincinnati to be an ideal location for grape cultivation, he established viticulture as a successful venture on the hills adjoining the city.

[4] He planted a vineyard of Catawba on the Mount Adams hillside and began making a sparkling wine from the grapes using the traditional method used in Champagne.

Longworth had found a lucrative market: the new German immigrants wanted an affordable, drinkable table wine to continue with the traditions of their homeland, and he enjoyed a virtual monopoly.