Multi-millionaire Jewish businessman Guma Aguiar has gone missing off the coast of Florida.

The Brazilian-born energy magnate went sailing at around 7.30pm on Tuesday night, but was not on his boat, the TT Zion, when it returned to shore at around 1.15am.

Police are still searching for the 35-year-old father of four, who has made philanthropic contributions to many Israeli and Jewish causes, including March of the Living and Nefesh B’Nefesh.

Aguiar also invested $5.5 million into Israeli football team Beitar Jerusalem and their basketball counterparts Hapoel Jerusalem in 2009, but has a history of mental problems.

He was involuntarily admitted into a psychiatric hospital in 2010 after displaying erratic behaviour, and last year had an emergency guardian appointed to watch over him after family members petitioned a court in Miami.

His mother Ellen has requested to become the temporary guardian of Aguiar’s $100 million fortune, declaring that her son suffers from a “severe bipolar disorder”, and that his disappearance therefore may be due to “mental derangement”.