|Date of birth||26 June 1973|
|Faction represented in Knesset|
|2019–||United Torah Judaism|
Tessler was born to Efraim and Haya Tessler; his father was a rabbi and head of the Vizhnitz yeshiva in Har Nof. He grew up in the Sanhedria neighbourhood of Jerusalem, and was educated at the Vizhnitz and Teshbin yeshivas.
After marrying, Tessler moved to Ashdod, where he was elected to the city council in 2013 as a member of Agudat Yisrael, having been a member of the party's religious council. He also worked for the Hamodia newspaper as a project manager, and became assistant to Minister of Health Yaakov Litzman in 2015.
Tessler was placed thirteenth on the United Torah Judaism list for the 2013 Knesset elections, but failed to win a seat as the alliance won seven seats. He held the thirteenth place on the UTJ list for the 2015 elections, but was again unsuccessful as the party won six seats. Prior to the 2019 Knesset elections, it was decided at the Agudat Yisrael conference that he would replace Eliezer Moses as the main representative of the Vizhnitz community, and he was subsequently placed fifth on the UTJ list. He was subsequently elected to the Knesset as the alliance won eight seats.
- 2013 United Torah Judaism list Israel Democracy Institute
- 2015 United Torah Judaism list CEC
- מרכז אגו"י החליט: אייכלר במקום הרביעי; טסלר יחליף את מוזס • צפו JDN, 31 January 2019
- 2019 United Torah Judaism list CEC
- Ya'akov Tessler on the Knesset website