[1][2] Known for his innovative approach to design, his built work favors width, rather than depth, to create better sightlines for an "intimate theatre" experience.

[7] He favored neoclassical façades, incorporating elements, such as ornamental iron balconies, patterned brickwork and grilles, as well as decorative pilasters, cornices, arches and frieze.

[9] His first independent commissions for them were the Broadhurst and the neighboring Plymouth Theatre (now known as the Schoenfeld), which opened within two weeks of each other, and were designed as mirror images of each other.

For the Majestic Theatre, Krapp incorporated stadium seating into the plans for the orchestra level, creating better sightlines and allowing for the creation of larger lounge and lobby areas.

Although the stock market crash of 1929 brought an end to the theatre building boom, Krapp remained with the Shuberts until 1963, supervising the maintenance and renovations of the existing venues.