1880 – Born on the 17th of January in Danville, Québec, Canada.
1912 – Sennett founded Keystone Studios in Edendale, California.
1915 – Keystone Studios became an autonomous production unit of the ambitious Triangle Pictures Corporation, as Sennett joined forces with movie bigwigs D. W. Griffith and Thomas Ince.
1917 – Sennett gave up the Keystone trademark and organized his own company, Mack Sennett Comedies Corporation, producing longer comedy short films and a few feature-length films.
1920 – Sennett moved over to Pathé distributors which had a huge market share but made bad decisions such as attempting to sell too many comedies at once.
1927 – Paramount and MGM, Hollywood’s two top studios, noting the profits being made by companies like Pathé and Educational, both re-entered the production and distribution of short subjects after several years.
1928 – Sennett occasionally experimented with color and was the first to get a talkie short subject on the market.
1932 – He was nominated for the Academy Award for Live Action Short Film in the comedy division for producing The Loud Mouth, and he won in the novelty division for his film Wrestling Swordfish.
1933 – Sennett’s studio did not survive the Depression; the Sennett-Paramount partnership lasted only one year, and Sennett was forced into bankruptcy in November.
1949 – He provided film footage for, and appeared in, the first full-length comedy compilation.
1956 – He was profiled in the television series This is Your Life, and made a cameo appearance in Abbott and Costello Meet the Keystone Kops.
– He contributed to the radio program Biography in Sound, broadcast on the 28th of February.
1960 – Died on the 5th of November in Woodland Hills, California at the age of 80 and was interred in the Holy Cross Cemetery in Culver City, California.