His firm, David S. Traub Associates, Architects, Planners and Interior Designers, has performed a variety of projects in the residential, commercial, and institutional fields.
Together with the firm Cairone and Kaupp he has envisioned a preliminary plan for a greenway along the Allegheny Avenue that connects Campbell Square and Pulaski Park on the Delaware River.
The exhibition documented with photographs, Philadelphia's multitude of narrow streets, small public squares and hidden gardens, focusing on a "secret" city many residents and tourists never see.
Traub has been involved in the area of historical restoration preparing plans for the reconstruction of a 19th-century Philadelphia school house and the Old Stetson Hospital Building.
Traub has written many articles concerning preservation issues that have arisen near the square and elsewhere, published amongst others in the Center City Weekly Press and The Philadelphia Inquirer.
[9] The book gives recognition to the overlooked views of Philadelphia and is made up of seven distinct sections:[10] 1) "Alluring Entryways": memorable doors and portals featured in various locations, including Pemberton, Smedley and Camac Streets.
Included in this section are scenes showing Cypress, Delhi, Iseminger, Fitzwater, Addison, Irving, Jessup, Manning, Waverly, Bonsall and Quince Streets, as well as St. Mark's Square.
4) "Hidden Courtyard": Philadelphia's architectural hideaways, including Loxley, Addison, Bladen s, Bell s, Green s and Drinker s Courts, as well as Lantern Square.
7) "Unnoticed Buildings": structures unique to Philadelphia, including two carriage houses, a Romanian Orthodox church, other Christian places of worship, an old shot tower, two notable synagogues from past and present, structures once housing a classic bank and firehouse, and residences only to be found in the Quaker City.Discovering Philadelphia – Places Little Known is a collection of unfamiliar photographs taken and assembled with descriptive captions.
Lincoln was in a depressed state of mind at the time due to the breakdown of his engagement to Mary Todd, setbacks in his political career, and his separation from Speed, who had recently left Illinois to return to Kentucky.