He's also supposedly 'crippled' by acid, which might narrow it down.
Indeed!
John doesn't seem that difficult to find -
"We have met. I have unfortunately worked with Elijah Cummings on more than one occasion. The latest was when he asked me to "assess" the viability of his wife's political campaign. The access granted for that proved very interesting."
He's also supposedly 'crippled' by acid, which might narrow it down.