Greg was at WISA for one season, 2018-2019 and then went back to MI. About a year later (during Covid), the WISA coaches split, with Novak/Kiliakov taking some students (including Green/P) to a different rink in VA....VA rinks reopening sooner than the rinks in their county in MD may have had something to do with that move....and some other teams (including Bratti/Somerville) staying with Dmitri Ilin at the rink in MD.
Greg and Dmitri seemed to be coaching together for another year or so...Greg doing the teams' choreo. IIRC, B/S were splitting their time between both places. Then when MIDA launched, B/S made a full-time move and then ultimately Green/P left Kiliakov/Novak and moved there.
I think Greg has continued to do choreo for some of Dmitri's students, including Ilin/Cain, who just split.