Weiss was born in Bunkie in Avoyelles Parish and died in the capital city of Baton Rouge.
His parents were Samuel Weiss, originally from Austria-Hungary and a merchant, and the former Gisella Elias, of Berlin, Germany.
On January 10, 1954, Bernard and Milton died in a private airplane crash, along with Thomas Elmer Braniff, the owner of the airline, and a number of other civic leaders from Shreveport, Louisiana, and Dallas, Texas.
For a time he was a department store clerk in Alexandria in Rapides Parish and the largest city in Central Louisiana.
Seymour was married twice: on April 19, 1925, to Notie "Fay" Turner, and then on June 12, 1963, to Elva Mae Lavie Kimball, whom he predeceased.
Weiss acted as Long's chief of protocol and resolved an unwitting comical dispute that developed when the governor received a German delegation at Mardi Gras in 1930 in a pair of pajamas, a red and blue robe, and blue bedroom slippers.
He was vice-president of the Win or Lose Corporation, a controversial oil company whose structure was devised by Huey Long.
He was indicted again on tax evasion and mail fraud charges growing out of the "Louisiana Scandals" of the late 1930s.
[2][3] Weiss was a member of the New Orleans Zoning Board and commissioner of the municipal fire and police departments between 1932 and 1936.
He was a director of the New Orleans chapter of the American Red Cross, the Chamber of Commerce, and the International Trade Mart.