Hall was previously head of sales at conveyancing rival GWlegal.
Andy Golding is set to become CEO of the combined group.
Gerry Johnson, who was director of second charge master broker My Sort of Loan, leaves behind a wife and two sons.
Prices in Aberdeen fell further than any other UK town or city outside London.
Former Blackpool and England player Stewart, who is based in the area, has been approached by a consortium of businessmen to lead their takeover bid.
Adams starts as sales director after joining from Santander UK.
There was an 8.4% rise in people applying for a second charge in the first half of 2018 compared to the corresponding period in 2017.
The panel will have four lenders: Funding Circle, iwoca, Whiteoak and Fleximise.