daniel brustlein's pen name: Unknown

I apologize, but there is no publicly known information about a pen name used by Daniel Brustlein. This information may not be readily available or may not exist.
Daniel Brustlein is a name that does not appear to have any significant association with a pen name or literary pseudonym. It is possible that he may use his real name for his writing or that his work has not yet been widely recognized. It is important to note that the absence of information about a pen name does not necessarily mean that one does not exist, but it suggests that it is not commonly known or publicized.