Fleisher returned to the US where he completed an undergraduate degree in political science at Yeshiva University, then a Juris Doctorate at the Cardozo School of Law.

[2][1] In 1999, Fleisher co-founded Kumah, "Arise" in Hebrew, a Neo-Zionist NGO whose mission is to enhance awareness about aliyah, the immigration of Jews from around the world back to Israel.

[13][14] In 2016, Fleisher argued against UNESCO's attempt to recognize the Tomb of the Patriarchs in Hebron as a Palestinian World Heritage Site.

Abigail Klein Leichman of The Jewish Standard wrote in 2015, "Rabbi Fleisher has become a go-to Israel expert for international media, including CNN, BBC, Al Jazeera, Russia Today, Xinhua, MTV, Sipa Press, and Fox News.

[18] In 2006 he ran for Knesset with the Atid Ehad party led by Dr. Avraham Neguisse and Yechezkel Stelzer.