Can anyone answer the original question? My significant other asked me today try to focus on these as well since he wants to open a new business in the Columbia, Maryland area. I checked out the John Hopkins age for EM residents, and it seemed like having a masters or phd helped as well as coming from an Ivy League school. While I have the MBA I'm not from a top 30 school and I'm actually not really interested in research. In do like the John Hopkins program because the four year program where PGY 4 could be used to specialize in management......whereas otherwise i prefer not to forgoe potential income for a purposeless extra residency year.
I was offered an interview at Hopkins and BWH/MGH for EM this cycle, but was not offered an interview at NY Pres. I do not have a PhD or masters. I went to state school for undergrad and a relatively new (read: not prestigious) state school for med school. I had a high step 1 (by normal people standards, probably not by SDN standards), a very high step 2 and great grades. I was told I had very strong letters, but none were from an EM residency (read: no real SLORS). I had a couple poster presentations and 1 textbook chapter pub, but all in a different field.
You definitely don't need to go to a top 40 med school, have a graduate degree/year(s) off for research, score a 260/260, complete several externships and get SLORS from top programs to get interviews at any of those programs. Heck, you don't need those things to get an interview at ANY EM program. EM is getting much more competitive, but it's not Radonc/derm/ortho/whatever. If you think you want to go there for residency, doing an externship would be your best bet. Realize that there is some randomness to applications and you may not get several interviews you were expecting. 2 of the interviews I didn't get were on my "backup/only interview here if i end up with <12 interview offers list" and my advisor said he believes I didn't get the NYP interview because I've always lived in the south, have no ties to NYC and didn't rotate anywhere outside of my school. Honestly, I had never been to NYC and applied to a couple programs there so I could justify a vacation over Christmas with my wife. Turns out they were smart in not interviewing me, I hated NYC and ranked the two NYC programs at which I interviewed last.
Personally, I don't know why you would want to do a 4th year of residency specializing in management when you could just as easily do a fellowship in admin, or, since you already have an MBA, simply try to focus on learning practice management while in residency then take a job that will let you work your way up in EM admin. Seems like taking a big pay cut for a marginal added benefit in your case.
As far as the "Columbia" area, there are plenty of other EM residencies in the NYC area.