Jennings O'Donovan is an international company headquartered in Ireland. With offices in the Middle East and Eastern Europe as well as Ireland, Jennings O'Donovan is a Cleantech company operating in the Environmental Goods and Services (EGS) Sector. The value of the global EGS market is expected to exceed €800 billion by 2015.  JOD operates in four of the Cleantech sub-sectors, namely, Renewable Energies; Efficient energy use and management (including eco-construction); Water and Wastewater Treatment; Environmental Consultancy and Services. 

Founded in 1950, Jennings O'Donovan is a wholly Irish owned consulting engineering organisation of highly qualified people with extensive work experience in Britain, USA, Romania, Cyprus, Bosnia-Herzegovina, Albania, Bulgaria, Bahrain, Egypt, Gaza, Jordan, Syria, Iraq, Libya, Saudi Arabia, Tanzania, Sudan, Malawi, Ethiopia, Kenya, Zambia, Nigeria, Central Africa Republic and Ireland.

In addition to the Cleantech Sector, the services provided by the company cover all aspects of civil and environmental engineering including aquaculture, structural engineering, flood risk studies, drainage and roads.

The main markets in which the company is currently operating are Ireland, UK, Eastern Europe and the Middle East with international offices in Albania, Romania, Bahrain and Saudi Arabia.