2001: Oceana is established by The Pew Charitable Trusts, Oak Foundation, Marisla Foundation (formerly Homeland Foundation), and the Rockefeller Brothers Fund.
2002: Oceana merges with American Oceans Campaign, founded by actor/environmentalist Ted Danson.
2003: Official opening of Oceana’s South American Oceans office in Santiago de Chile. September 2003: Oceana strengthens European Office in Madrid, Spain.
2004: Oceana Europe opens its new branch in Brussels, Belgium.
2005: After 5 months documenting fragile marine ecosystem in North and Central American waters, the Oceana Ranger completes the transatlantic expedition.
2006: The first European expedition of the Oceana Ranger crosses the Mediterranean
2007: The Oceana Ranger crosses again the Mediterranean studying vulnerable marine habitats, marine protected areas and documenting the impact of destructive fishing.
2008: Oceana Europe launches two expeditions at the same time. The Oceana Ranger expedition studies the Atlantic and the Bay of Biscay while the Oceana-Marviva expedition crosses the Mediterranean and reaches Greece.
2009: Oceana opens its new office in Belize.