* This is a misspelling: You may have misremembered or mistyped the name. Perhaps it's similar to a known person, or a fictional character.
* It's a private individual: There might be someone named Dan Gleesak, but they are not publicly known or haven't achieved any particular prominence.
To help me assist you better, please provide more context:
* Where did you encounter this name? (Book, article, online, etc.)
* What is the context of the name? (A character in a story, a historical figure, etc.)
With more information, I can try to identify who you're looking for.