Ask HN: How to earn reputation as a marketeer?

Internal - Use Hard Metrics. If you are the marketing team and have an influence on the final sale (ie:Your clicks convert to paid subscribers/purchases) then proving how you brought home the bacon, is a good metric to use.

In bigger enterprise type environments - show how you can automate and mature marketing processes.

External - Offer Something Tweet, blog about your work, speak at conferences, attend user groups for marketers.... I know people who have built good career paths based on their perceived expertise from a few talks at marketing conferences. These are some ways to build your reputation externally.