* Mandrake the Magician: This character was created by Lee Falk, a prolific comic strip creator. He debuted in 1934 and was a popular magician character with supernatural powers.
* The Phantom: Also created by Lee Falk, this character debuted in 1936. The Phantom is a costumed crime fighter who operates in the jungle and is known as "The Ghost Who Walks".
So, the answer to your question is Lee Falk created both Mandrake the Magician and The Phantom.