There are some attorneys who are JW's. The couple that I know donate their services to WTS. One was a convert and he/she even semi-retired from their law firm and worked full time at Bethel for several years. The other was a paralegal and his/her employer put them through law school and he/she works pro bono for WTS with the estates of local JW's wanting to gift $$ to WTS.
The high profile cases -- I suspect WTS hired the high profile (worldly) attorneys for some of these as there is too much liability at risk just beyond the case at hand.