The background by poets.org
Shel Silverstein was born on September 25, 1930 in Chicago, Illinois and began writing and drawing at a young age. He became a cartoonist, playwright, poet, performer, recording artist, and Grammy-winning, Oscar-nominated songwriter.
Silverstein is best known as the author of iconic books of prose and poetry for young readers. His works include such modern classics asLafcadio: The Lion Who Shot Back(1963), The Giving Tree (1964), A Giraffe and a Half (1964), The Missing Piece (1976), and The Missing Piece Meets the Big O (1981). His immensely popular poetry collections are Where the Sidewalk Ends, a 1974 Michigan Young Readers Award winner; A Light in the Attic, recipient of the School Library Journal Best Books Award in 1982;Falling Up (1996); and Don’t Bump the Glump! And Other Fantasies, which was originally published in 1963 and reissued in 2008.Runny Babbit, a posthumous poetry collection of spoonerisms, was conceived and completed before his death.
Silverstein’s books, which he also illustrated, are characterized by a deft mixing of the sly and the serious, the macabre, and the just plain silly. His unique imagination and bold brand of humor is beloved by countless adults and children throughout the world. He died in May 1999.
Now for my own review:
I like this poet very much and also many others because i have a special admiration to those who can sketch/draw children cartoon books.an example is this 
This image can also be found at the website provided at the bottom I find his language quite cute , example like his famous story a girraffe and a half
"if you have a giraffe and it was stretched another half,
you get a giraffe and a half,
if he put on a hat, and inside lived a rat,
you would have a giraffe and a half and a rat in his hat
if you dressed him in a suite and he looked very cute,
you would have a giraffe and a half with a rat in his hat looking cute in a suit."
To me , this poet aims to taget children 13 or below,which still applies for me .
three poems by him.
Where the Sidewalk Ends by Shel Silverstein There is a place where the sidewalk ends
And before the street begins,
And there the grass grows soft and white,
And there the sun burns crimson bright,
And there the moon-bird rests from his flight
To cool in the peppermint wind. Let us leave this place where the smoke blows black
And the dark street winds and bends.
Past the pits where the asphalt flowers grow
We shall walk with a walk that is measured and slow,
And watch where the chalk-white arrows go
To the place where the sidewalk ends.
Yes we'll walk with a walk that is measured and slow,
And we'll go where the chalk-white arrows go,
For the children, they mark, and the children, they know
The place where the sidewalk ends.
Mr. Grumpledump's Song by Shel Silverstein If the World Was Crazy by Shel Silverstein If the world was crazy, you know what I'd eat?
A big slice of soup and a whole quart of meat,
A lemonade sandwich, and then I might try
Some roasted ice cream or a bicycle pie,
A nice notebook salad, an underwear roast,
An omelet of hats and some crisp cardboard toast,
A thick malted milk made from pencils and daisies,
And that's what I'd eat if the world was crazy.
If the world was crazy, you know what I'd wear?
A chocolate suit and a tie of eclair,
Some marshmallow earmuffs, some licorice shoes,
And I'd read a paper of peppermint news.
I'd call the boys "Suzy" and I'd call the girls "Harry,"
I'd talk through my ears, and I always would carry
A paper umbrella for when it grew hazy
To keep in the rain, if the world was crazy. If the world was crazy, you know what I'd do?
I'd walk on the ocean and swim in my shoe,
I'd fly through the ground and I'd skip through the air,
I'd run down the bathtub and bathe on the stair.
When I met somebody I'd say "G'bye, Joe,"
And when I was leaving--then I'd say "Hello."
And the greatest of men would be silly and lazy
So I would be king...if the world was crazy.
http://www.poets.org/viewmedia.php/prmMID/16737
Mr. Grumpledump's Song by Shel Silverstein Everything's wrong,
Days are too long,
Sunshine's too hot,
Wind is too strong.
Clouds are too fluffy,
Grass is too green,
Ground is too dusty,
Sheets are too clean.
Stars are too twinkly,
Moon is too high,
Water's too drippy,
Sand is too dry.
Rocks are too heavy,
Feathers too light,
Kids are too noisy,
Shoes are too tight.
Folks are too happy,
Singin' their songs.
Why can't they see it?
Everything's wrong!
http://www.poets.org/viewmedia.php/prmMID/20542
more can be found at this highly animated website
Shel silverstein
