楼主
[名] floor host .; 即 斑竹,版主 . the page host,the web page host,the web page editor.; post starter, thread starter, 网络用语,发主题帖的人,“楼猪”,“LZ”;
[例句]如果楼主和写信人是恋人,这篇文章暗示着你们要分手了。
If you and the author are lovers, the letter imply that you are breaking up.
Topic creator
所谓的楼主,一般是贴吧或者论坛话题或者主题的创建者,
所以根据理解翻译成了 Topic creator