Looking for Advertising Agencys (Rotterdam)

Hello fellow expats,
hope you can help me with the following request: I am currently searching for Ad-Agencys in and around Rotterdam. Of course I know that the best place to look for those contacts is Amsterdam, but maybe you know some in and around Rotterdam and you also might have worked with them. I know the request could be more specific, but to start with, any company name or contact you can drop me would be helpful. Thanks in advance! Chris