[11] Together with music and entertainment personality David Fishof, founder of Rock 'n Roll Fantasy Camp, Grundwerg oversaw the production of the Independence Day celebration for Israel's 70th anniversary at Universal Studios[disambiguation needed].

[13] While in Los Angeles, Grundwerg hosted events with many stars, including Gal Gadot, Billy Crystal, Mayim Bialik and Sharon Stone.

[14] In 2017, an event he organized at the Israeli consulate in Los Angeles marking Ramadan featured a discussion with Kareem Abdul-Jabbar on the importance of Muslim-Jewish relations and cross-cultural exchange.

[15] In 2018, Grundwerg was appointed World Chairman of Keren Hayesod-United Israel Appeal, the “fundraising arm of the Zionist movement,” [16]with branches in 45 countries.

[17] Under Grundwerg, Keren Hayesod raised money for a field hospital in Ukraine and organized an emergency aliyah campaign.

[18] Since the Russian invasion of Ukraine in February 2022, Grundwerg has worked closely with Steven Lowy, chairman of the Board of Trustees, and Keren Hayesod's partner organizations, to expedite the aliyah of Ukrainian Jews affected by the fighting.