Adrian Heathcote is a philosopher specializing in philosophy of mathematics and physics. He lectured for over two decades at the University of Sydney.

Phillip Hynek is a veteran wargamer. We talk about Allan B. Calhamer's classic boardgame "Diplomacy".

Asher Reich is a rabbi, teacher, and Talmudic scholar. He studied in Ponevezh Yeshiva under Rav Shach and received his rabbinical ordination from Rav Yitzchok Weiss, the Av Beth Din of Jerusalem.

Salvatore Babones is an associate professor of sociology at the University of Sydney. We talk about his new book, "The New Authoritarianism: Trump, Populism, and the Tyranny of Experts" - 30% off this week by clicking link at: http://buildingjerusalem.org

Brett Kelly is the founder and CEO of Kelly+Partners. He is a best-selling author, public speaker, and chartered accountant.

Vic Alhadeff is the CEO of the NSW Jewish Board of Deputies. He is the spokesperson of Keep NSW Safe, and former editor of the Australian Jewish News.

Ros Ben Moshe is the Director of LaughLife Wellbeing, an organization that provides workshops and coaching on resilience and positivity in the face of adversity. Her first book is "Laughing at Cancer".

Dominic Wy Kanak is the Greens candidate for the upcoming Wentworth by-election.

Andrea Leong is the Science Party candidate for the upcoming Wentworth by-election.

Tim Murray is the Labor candidate for the upcoming Wentworth by-election.