Bowman-Boyles joins the agency from her role as head of employee and change communications at BT's Operate division.
She has previously worked agency-side holding senior positions at Burson-Marsteller, GolinHarris and Weber Group.
Bowman-Boyles will take charge of the tech practice and work on accounts for the agency's recent Xerox win and for clients Microsoft, Texas Instruments and Intermec.
She will report into UK GM Shaun Wootton.
He said of her appointment: 'Chantal brings a wealth of blue-chip technology experience to our UK team.
'Her ability to drive communications campaigns across channels and a wide range of audiences will bolster our integrated approach.'