I ran the Forum for three years. I’m no longer an active moderator, but I still provide advice to the team in some cases.
I’m a Communications Officer at Open Philanthropy. Before that, I worked at CEA, on the Forum and other projects. I also started Yale’s student EA group, and I spend a few hours a month advising a small, un-Googleable private foundation that makes EA-adjacent donations.
Outside of EA, I play Magic: the Gathering on a semi-professional level and donate half my winnings (more than $50k in 2020) to charity.
Before my first job in EA, I was a tutor, a freelance writer, a tech support agent, and a music journalist. I blog, and keep a public list of my donations, at aarongertler.net.
I think of EA as a broad movement, similar to environmentalism — much smaller, of course, which leads to some natural centralization in terms of e.g. the number of big conferences, but still relatively spread-out and heterogenous in terms of what people think about and work on.
Anything that spans GiveWell, MIRI, and Mercy for Animals already seems broad to me, and that’s not accounting for hundreds of university/city meetups around the world (some of which have funding, some of which don’t, and which I’m sure host people with a very wide range of views — if my time in such groups is any indication).
That’s my way of saying that SMA seems at least EA-flavored, given the people behind it and many of the causes name-checked on the website. At a glance, it seems pretty low on the “measuring impact” scale, but you could say the same of many orgs that are EA-flavored. I’d be totally unsurprised to see people go through an SMA program and end up at EA Global, or to see an SMA alumnus create a charity that Open Phil eventually funds.
(There may be some other factor you’re thinking of when you think of breadth — I could see arguments for both sides of the question!)