Nannar joined the agency in 2001 and recently became account director, working on accounts including Cancer Research UK, The Prostate Cancer Charity and Wales Millennium Centre. She has also played a significant role in the firm's development team.
Jackie Fowler, Burnett Works' managing director, said: "I'm delighted that Jaz will now work more closely with me to lead Burnett Works, both on a day-to-day basis and through the next stage of the agency's development. We have lots of exciting work and opportunities ahead of us and I'm confident that Burnett Works will go from strength to strength."
Before joining Burnett Works, Nannar worked client-side in fundraising, including stints at the Cystic Fibrosis Trust and the disability charity John Grooms.
Burnett Works' clients include Friends of the Earth, UNHCR, Plan UK and The Camphill Family.