The Harold K.L. Castle Foundation it is the largest private foundation headquartered in the State of Hawaii.
Mission.
The foundation awards grants to close achievement and preparation gaps in public education in Hawaii, restore nearshore marine ecosystems, and strengthen Windward Oahu communities.
History.
Founder Harold Kainalu Long Castle was the owner of Kaneohe Ranch. The Castle Medical Center was named after Harold K.L. Castle's father, James Bicknell Castle. The foundation has contributed more than $8 million to the medical center and more than $143 million in grants.
Since 2000, the foundation has granted more than $60 million; more than $50 million has gone to organizations serving the Windward side of Oahu. 
Foundation disburses an average of $7,000,000 in grants per year.
The foundation provides grants from $500 to $5,000 to Windward youth group activities that include community service.
Investments include grants for the Bishop Museum, Teach for America and stem cell research.
References.
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