Here's another yard-stick from another type of non-profit:
The president of Stanford University, with $37.8B endowment, $7.4B annual operating costs and 16,000 employees, makes much less at about $1.1 Million / year. This is roughly typical for elite university presidents. He (Marc Tessier-Lavigne) was also one of the world's leading neuroscientists before going into administration.
There is no evidence that Max Siegel does anything that couldn't be done by thousands of other executive-level admins (and probably done better). This is thoroughly rotten. Is his compensation due to incompetence or criminality?