His appointment is one of five additions this month aimed at strengthening the agency on the back of new business wins including Your Bank, GlaxoSmithKline and the growth of retained accounts Direct Line, SEAT and Radox.
Pritchard, who was head of channel development at Weapon7 and worked with Coca Cola and GSK, has over 15 years experience in the digital arena and will be responsible for leading strategic digital thinking at Geronimo.
Andy Snuggs, managing director of Geronimo, said: "It has been an astonishingly successful year and as such we are growing rapidly as an agency. Eaon's CV speaks for itself and his previous work has been acknowledged by the industry as being innovative and inspiring, so we feel that he will fit right in at Geronimo."
Pritchard added: "Geronimo has been on my radar for a while as an agency that delivers impressive results across all channels, including digital. The distinguished client list combined with the calibre of staff makes this a fantastic opportunity for me, and I am looking forward to getting started."
The four other appointments are Richard Gallon as senior interactive designer; Ben Crook as digital project manager; Hiroshi Suzuki as digital designer; and Jameson Thomas as Mac designer.