Principals:
Keith Lowey is a CPA and name partner in a CPA firm in Foxboro, MA. (Verdolino & Lowey P.C)
http://www.vlpc.com/personnel.cfm
Mary Jo Schindler (Bailey) is listed as working in the same firm.
https://www.zoominfo.com/p/Maryjo-Schindler/1455325862
Didn't take the time to search for Thomas Bailey, but he's likely Schindler's husband.
Lowey's been connected to Warren since at least 2012.
Senator-elect Elizabeth Warren creates leadership PAC – 'PAC for a Level Playing Field'
Updated Dec 24, 2012; Posted Dec 24, 2012
https://www.masslive.com/politics/index.ssf/2012/12/senator-elect_elizabeth_warren_3.html
FTA:
Warren on Thursday filed papers with the Federal Election Commission to form the “PAC for a Level Playing Field.”
The treasurer of the PAC is listed as Keith Lowey, a certified public accountant and principal at the CPA and financial consulting firm Verdolino & Lowey. The PAC is registered at Lowey’s business address in Foxborough. The name of the PAC comes from Warren’s mantra on the campaign trail, that she wants to “level the playing field” for working families.
A leadership PAC is a common tool used by members of Congress to raise money for their party and for other candidates.