Gilbert served on the board of trustees of the
Los Angeles County Museum of Art (LACMA). He loaned a large collection of objets d'art to the Museum from the 1970s to the mid-1990s. He discontinued the agreement due to limited space at the LACMA.
Jacob Rothschild, 4th Baron Rothschild, the Chairman of the
Heritage Lottery Fund, agreed to build a US$30 million gallery inside
Somerset House to display the collection and attract visitors. In 2018, the V&A embarked on a research project into the provenance of the Gilbert Collection, culminating in the '
Concealed Histories. Uncovering the Story of Nazi Looting' exhibition. Additionally, Gilbert supported Jewish charitable causes in Europe and Israel. He made charitable contributions to the
February 1941 Foundation, a non-profit organization which honors Dutch people who helped Jews escape from Nazi barbarism during World War II. ==Personal life==