Part One

• Warner Bros. bought their cartoons at first from Leon Schlesinger
  Productions.  Releasing their first
  cartoon in 1930.  The animators were Hugh
  Harman and Rudolph Ising.  (Harman-Ising
  created for Leon Schlesinger)

•  
  In May 1930, Bosko was introduced as an animated blob of ink resembling
  Mickey Mouse.  At the end of this first
  cartoon, Bosko squiggled back into the inkwell, saying, "so long,
  folks!" beginning a Warner Bros. tradition.

•  In 1934 Chuck Jones began his career as an animator with The Miller's Daughter and Those Beautiful Dames.  His credits include 11 other cartoons between
  1934-1937.

• Chuck Jones had his directorial debut in 1938 with The Night Watchman.

• By 1942, Warner Bros. animated short cartoons were the most popular
  cartoons being created.  About this time,
  Chuck Jones is credited with changing the look of short animated films forever
  with his production of The Dover Boys.  By stylizing movement and the backgrounds on
  which it played, Jones forsook the traditional approach favored by Disney
  Studios, where every little detail was drawn. 
  By doing this, Jones was able to put the focus on the action, the
  atmosphere and the characters.

• In 1945, Bugs Bunny cartoons were nominated the #1 short subject film
  in the Motion Picture Herald's poll of exhibitors — a title they held for the
  next 16 years!

• From 1945 until the WB Animation Studio closed in 1963 is considered
  the "Golden Years" of the short animated film.  Many of the most famous Warner Bros.
  characters were created then by not only Chuck Jones (Pepe le Pew, Road Runner
  & Wile E. Coyote, Marvin the Martian, Gossamer, Ralph Phillips, Marc
  Anthony and Kitty, Junyer Bear, Henery Hawk, Ralph Wolf, Sam Sheepdog, Hugo the
  Abominable Snowman, Frisky Puppy and Charlie Dog) but also Friz Freleng
  (Sylvester the Cat and most notably, Yosemite Sam) and Robert McKimson (the
  Tasmanian Devil and Foghorn Leghorn).

•  From the early 1940s until 1949 there were at least 4 animation units
  working at the Warner Bros. Studios. 
  After 1949, there were just the Jones, Freleng and McKimson units
  creating 10 – 6 minute cartoons each per year.

Part two to follow.