[2] He graduated from Tel Aviv University with an LLB and a BA in Middle Eastern and African history.

Although he received an exemption from national service for health reasons, he volunteered to serve in the Israel Defense Forces and spent six years in the army, the latter two as part of the IDF delegation to India, Nepal and Sri Lanka.

Prior to the 2015 Knesset elections he was placed thirtieth on the party's list,[4] but it won only eleven seats.

However, he re-entered the Knesset again on 19 June 2020 as a replacement for Hili Tropper,[7] who had resigned his seat under the Norwegian Law after being appointed to a cabinet ministry.

Lahav-Hertzanu was placed fourteenth on the Yesh Atid list for the 2021 election and was re-elected as the party won 17 seats.