On verso is given the name of Harold M. Anderson.  I have also found a Harold N. Anderson (different middle initial).  Appears to be the same person, since the dates match.

Also given on verso is the Society of Illustrators, of which he was a member.

Wonderful illustration work, done in humor and friendship (as the attribution bottom right indicates/ 2nd photo).

13-7/8" X 10-7/8".

Unframed.

Great holiday gift for a collector of illustration art.