What career is where a person gets the word out about an Organization and it's events?

[Dr. Terri Genius MD/PhDâ„¢]

for example:

an art museum is having a new exhibit. who is the person the writes the information for the brochures, updates the museum's website about the event, and manages the museum's twitter, facebook, youtube account, writes the newsletters and manages the museum's blog?

what would you call that person?
How can I find a job doing this?

(the museum is just an example, it can be any other type of organization.)

[john]

sounds like Public Relations, or somesort of Marketing person