Lacking any other advice, just call the main ER number and ask to speak to an attending physician. They can always give you the name and number of the person to talk to.
Check out the SAEM website under the residency catalog... here's the link. Click on the 1-3 yr programs and look up ressurection and christ. It should give you the names of the clerkship directors and how to set up an MS4 rotation.