Background
Sonnenberg was born in Brest-Litovsk, Russia, now part of Belarus.
Sonnenberg was born in Brest-Litovsk, Russia, now part of Belarus.
He briefly attended Columbia College and worked for a newspaper in Flint, Michigan.
He emigrated to the United States with his family in 1910. Returning to New York City, his first work in the public relations field was writing stories for the American Jewish Joint Distribution Committee. He started his own business in 1924, where among his initial clients were Manhattan hotels for which he generated newspaper coverage of their notable guests.
Sonnenberg had a knack for self-promotion, as a means to make himself seem more important to the public and to his existing and prospective clients.
Early in his career, he would ride the subway most of the trip and then take a taxi to show up at theater openings. In restaurants, he would have the restaurant manager send a bus boy to wander around the tables announcing that there was a phone call for Sonnenberg.
A self-described "cabinetmaker who fashioned large pedestals for small statues", Sonnenberg represented such individuals as Samuel Goldwyn, Robert Lehman, William South. Paley and David O. Selznick. His corporate clients included Columbia Broadcasting System, Lever Brothers, Lipton Tea and Pan American World Airways.
While his company, Publicity Consultants Incorporated., was nominally located in offices on Park Avenue, his real business was done in his five-story townhouse in the Gramercy Park neighborhood of Manhattan, where he was renowned for his lavish entertaining for his clients and his contacts in the press
Sonnenberg died in New York City at age 77 of a heart attack on September 6, 1978. As dictated by his will, he directed that " my executors as soon as practicable after my death to destroy all data, files and correspondence", which would combine with the reticence of his friends to make it difficult to write about his exploits. His will also specified that the contents of his townhouse were auctioned off by Sotheby"s in June 1979.
Crowds of 30,000 came to view items over a nine-day period, and the $4.7 million generated at auction were the third-highest in auction history at the time, behind Norton Simon"s $12.7 million and the $7.5 million for items from the estate of Geraldine Rockefeller Dodge.
The top-selling lot in the sale was for a John Singer Sargent portrait of Millicent Leveson-Gower, Duchess of Sutherland, which sold for $210,000, setting a record for the artist"s work.