George Leonard Carlson was supposedly born in 1887, a year that may have signaled a sea change in the career paths of illustrators. John Austen and Kay Nielsen were born in 1886, Frank Godwin, John Held, Jr., Harry Clarke and Percy Crosby in 1889. The painters seem to be giving way to the pen and ink school.
The earliest work found from the man is in 1917, when he'd have been 30 years old. There's nearly another decade gap in his career. In 1920 and 1921 he illustrates two children's books by Gene Stone: Jane and the Owl and Adventures of Jane. In 1928 he did the illustrations for The Adventures of Toby Spaniel. Then in 1931, he provides a color frontis and black and white illustrations for Fact and Story Reader - book eight. The illustrations are in pen and ink and it is this medium in which he excels. In 1933 he authored a book, Draw Comics -Here's How-! in which he proclaims to be an expert in comic strips and panels.
In 1936 he illustrated the dust jacket for the first novel by an unknown author. The following year, Carlson wrote and illustrated a series of Pastime Fun Books for Platt and Munk. Fun-Time Games, Puzzles, Stunts, Drawings, etc. That year saw another how-to book, Points on Cartooning. Then he became the illustrator for Howard Garis' classic nonsense series of Uncle Wiggily stories in 1939.
Jingle Jangle Comics started in February of 1942. Carlson drew the covers for the first six issues and two 6- to 10-page strips in each issue until its demise with #42 in December of 1949. Carlson did other comic book work, but it was primarily variations on his puzzle fun pages. He released a book of them, 1001 Riddles for Children in 1949 and a similar collection of his 1937 Fun Books titled Fun For Juniors. The latest work I've seen is another book on drawing, I Can Draw, in 1953, meant for very young artists.
Carlson died in 1962.
(source: http://www.bpib.com/illustrat/carlson.htm)