Sanders does not regularly attend synagogue, and he does not refrain from working on Rosh Hashanah, as observant Jews do. He has attended yahrzeit observances in memory of the deceased, for the father of a friend, and in 2015 attended a Tashlikh, an atonement ceremony, with the mayor of Lynchburg on the afternoon of Rosh Hashanah. According to his close friend Richard Sugarman, a professor of religious studies at the University of Vermont, Sanders's Jewish identity is "certainly more ethnic and cultural than religious." Deborah Dash Moore, a Judaic scholar at the University of Michigan, has said that Sanders has a particular type of "ethnic Jewishness that is out of style these days among American Jews." His wife is Roman Catholic, and he has often expressed admiration for Pope Francis, saying that "the leader of the Catholic Church is raising profound issues. It is important that we listen to what he has said." He has said he feels very close to Francis's economic teachings, describing him as "incredibly smart and brave." In April 2016, he accepted an invitation from Marcelo Sánchez Sorondo, an aide close to Francis, to speak at a Vatican conference on economic and environmental issues. While at the Vatican, he met briefly with Francis.