Rabbi Leonard Gewirtz–a man I always
affectionately referred to as literally ``my rabbi.''
-Joe Biden
https://www.govinfo.gov/content/pkg/CREC-2004-05-20/html/CREC-2004-05-20-pt1-PgS5897-2.htm
Rabbi Gewitrz was a Talmudist, as we see from the preface of his 1961 book:
"Leonard B. Gewirtz a spiritual leader who seeks out philosophical themes to point up the profound instruction of Judaism….he introduces the conclusions of psychology and sociology, of Talmudic erudition and historical research into the careful understanding of Torah ideals and their practical expression in the modern world."
https://archive.org/stream/authenticjewandh012856mbp/authenticjewandh012856mbp_djvu.txt
In 2013, Biden had a Jewish Sukkah built at his home, by CHABAD
https://obamawhitehouse.archives.gov/realitycheck/blog/2013/09/25/first-vice-presidential-sukkah
"On the holiday of Sukkot, Jewish people spend time in the sukkah."
https://chabad.org/library/article_cdo/aid/609535/jewish/What-Is-a-Sukkah.htm