[9][10] Kluge founded Eirene, an angel investment firm that supports social causes and provides consulting services on cause marketing and analytic giving.
[2] One of his investments is Fonderie 47, a social enterprise that recovers weapons from conflict zones and melts them down to produce luxury items such as watches and accessories.
[15] He is the author of two books: Charity & Philanthropy for Dummies (2013)[16] and John Kluge: Stories (2015), published by Columbia University Press.
[21][22][23] In 2017, after President Donald Trump announced a tariff against Mexican products, Kluge raised $25,000 as a proposal for a flag-raising ceremony in front of the winery to celebrate Mexican-American partnership.
[24] In 2021, he helped launch the "truth farm," a public art installation dedicated to conversations about immigration, next to the Trump family winery.