If seen in the ED, help them if they are looking for a patient, nurse, etc.  “What can I do to help?  These relationships pay dividends in the future.<unk>  are like a house guest so greet them and be social, e.g.  “What happened to the patient we admitted with peritonitis the other day?” 
When you dump on them, and you will dump on them, admit it. “Look, there is nothing wrong with this lady, but we can’t get the family to take her home. We are calling her a TIA but don’t go nuts trying to find out a reason for it, we just need to get her into the hospital.” They will be more understanding than if you lie to them.
Do M & M conferences with other groups and know with some of their literature.   Participate on committees, preferably one of the worst committees. It is invaluable.
Show up at the social events that ED docs never attend. You might hate it, but it will pay you back in spades. 
Don’t have a confrontational attitude. It is not us versus them. Life is so much easier when you have the medical staff on your side. You can cajole and get what you want without fighting for the most part.    The definition of emergency medicine is understated confidence. You don’t have to go around thumping your chest. They are going to know it by what you do. Having a good relationship with<unk>  means ‘if you say the patient needs to be admitted, it needs to be admitted.’”
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