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Year
The Studio
1903 Harry, Albert, Sam and Jack, the four founding Warner brothers emigrated from Poland to Ontario in Canada. The three elder brothers opened their first movie theater in New Castle, Pennsylvania.
1904 The Warner brothers founded the Duquesne Amusement & Supply company to distribute films (based in Pittsburgh).
1912 Harry Warner hired an auditor named Paul Chase to look after the accounts.
1918 Warner Bros, the 3rd oldest Hollywood studio (after Paramount and Universal, both founded in 1912), was founded by Jewish immigrants from Poland, originally based on Sunset Boulevard in Hollywood.
1923 April 4th - Warner Brothers Pictures, Incorporated is formally setup.
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Sources:

Wikipedia - Warner Bros page

Warner Brothers Studios - Chronology