CALLISTER CLIENTS
- Ards District Council
- African Children’s Choir
- BBC
- Community Relations Council
- CCN Europe
- CTV International
- Church of Ireland
- Corrymeela Community
- D.O.E. (N. Ireland)
- ERF (Germany)
- Friends In The West International
- Fermanagh District Council
- Fujitsu
- Lisburn Borough Council
- Making Belfast Work
- Mediation Network
- The Media Partnership
- The Northern Ireland Court Service
- The Northern Ireland Tourist Board
- Norsk TV (Norway)
- On Screen Solutions
- The Pacific Institute (US & UK)
- PSNI
- Presbyterian Board of Social Witness
- RAI TV (Italy)
- Ryobi
- RTE
- The Sandown Group
- SKY TV
- The Sandown Group
- Ulster Bank
- UTV
- The Ulster New Zealand Trust
- World Council of Churches
- Word Entertainment US
