Through his development company Webb and Knapp—for which he began working in 1938 and which he purchased in 1949—he developed a significant portion of the New York City urban landscape.
Melalui perusahaan pengembangnya Webb and Knapp—dimana ia mulai bekerja pada 1938 dan ia jual pada 1949—ia mengembangkan porsi signifikan dari lanskap perkotaan New York City.