Over the course of four decades, he designed over 280 buildings in Louisiana, including several plantation houses during the antebellum era.

[1][2][5] A few years later, he completed the Pontalba Buildings, started by James Gallier.

Has more fresco wall decoration and stenciling than probably any other mid-nineteenth century residence in the South.

"[7] In at least a few of these projects, Howard worked with a partner, Albert Diettel, including Edgewood and possibly Indian Camp Plantation.

[4] Over the course of his career, he designed over 280 buildings,[4] some of which were wrongly attributed to James Gallier.