Eileen will succeed current chair Catherine Duffy on 1 May 2019.
After a successful three-year term, Catherine will continue in her role as one of the firm’s senior finance partners.
Roberts is one of the firm’s most experienced partners in its litigation and dispute resolution department.
She will continue to work with her existing clients while fulfilling her role as chair.
Managing partner Julian Yarr said: “I welcome Eileen’s appointment to this senior leadership role. The chair of the partnership is an important role for the firm and I look forward to working with Eileen in the years ahead.”