His father, Leon (Leopold) Loeb, was born to a Jewish family in Alsace, France, and immigrated to Los Angeles in 1853 where he opened a dry goods store.[2] Given that Los Angeles was a small city at the time (5,000 population), he quickly met Harris Newmark, a prominent established Jewish businessman; and in 1879 married his daughter Estelle.[2] His grandfather was the author of My Sixty Years in Southern California 1853–1913.[3][4] Harris Newmark had emigrated from Löbau (also spelled Loebau), Prussia.
In 1874, he joined with his cousin, Marc Eugene Meyer, Constant Meyer, and Nathan Cahn to purchase the S. Lazard & Co. business from Solomon Lazard, and thence operated as Eugene Meyer & Co.[5][6] In January 1879, Leopold Loeb was added as a partner to Eugene Meyer & Co.[6] In October 1883 the Meyers sold out, Eugene Meyer moved to San Francisco, Emmanuel L. Stern was admitted, and the three partners formed Stern, Cahn & Loeb.[7] At this time Stern, Cahn & Loeb started promoting the store as "The City of Paris"[3] later after the departure of Mr. Cahn becoming Stern, Loeb & Co..
Meyer had also been the French Consular Agent in Los Angeles, and he recommended Leopold Loeb to take as consul, which he did in 1883.[8][3] Leopold Loeb served as the French Consular Agent for over fifteen years.[3]
After Joseph's graduation he law clerked with the Henry O’Melveny law firm. In 1906, he was admitted to the bar in Los Angeles and retained his association with the O’Melveny firm until 1907. At that time, he joined Edward G. Kuster in the practice of law; and, in 1908, they, along with Edwin, formed the law firm of Kuster, Loeb & Loeb.[1] Edwin and Joseph Loeb read proof for their grandfather, Harris Newmark, at the time of the publication of his book on Southern California.
About 1911, Edward Kuster left the law office, and the firm of Loeb & Loeb was established. Over the years, the firm has operated under various names: Lowenthal, Loeb & Walker; Loeb, Walker & Loeb, to the current name, Loeb & Loeb, in 1938.[1] Joseph's contribution to the firm was the handling of corporate business accounts.[3] (Edwin took care of their movie studio clients.)[3] In particular, the firm become notable for representing their cousin Kaspare Cohn's enterprises: Kaspare Cohn Hospital (later Cedars of Lebanon, and now known as Cedars-Sinai Medical Center) and Kaspare Cohn Bank (now Union Bank of California),[3] where he was a director. The Loeb & Loeb firm went from a two-man practice in its beginnings to a large international law firm.
Loeb married Amy Cordelia Kahn (1885–1967) of San Francisco on January 24, 1909. They were the parents of two daughters: Kathleen (Mrs. Edward J. Bernath), born November 11, 1910; and Margaret (Mrs. Edward J. Soares), born June 10, 1913. Mr. Loeb retired from law practice in June 1965.