She will lead the group’s specialist teams responsible for investment, digital, data and technology for clients.
Jordan will also oversee Havas Media Group’s investment and trading teams, as well as the specialist digital brands: Affiperf (trading desk); Socialyse (social media buying and strategy); Ecselis (digital performance); Mobext (full service mobile); WebNarrative (user experience and web build) and DBi (data and marketing technology consultancy).
She will also join the board and report into Paul Frampton, the group managing director at Havas Media Group UK.
Frampton said: "At Havas Media Group UK we are pioneering a unique and disruptive model with genuine collaboration at its heart.
"Julia’s distinctive leadership skills are well suited to managing effective teams in this media environment and will be a real asset to the next phase of implementing our #Havastogether positioning."
Jordan was at UKTV for seven years overseeing the technology and operations, compliance and regulatory affairs, ad-funded content and advertising sales teams. She left in August last year.
She began her career at ITV, and then moved to Channel 4 in 1992 for three years. Jordan has also worked at Virgin Media Television and Flextech Television.
Jordan said: "This is an agency on an exciting journey, with a strong leadership team that is energized, ambitious and committed. I am excited to be working in a role that will allow me to utilise my commercial acumen and leadership skills to achieve tangible results."