He is the former mayor of Võhma and has served in the IX, XI, XIV and XV Riigikogu.

[1] Jaak Aab attended school in Ala (Helme Parish in Valga County) and in Viljandi.

From February 2002 to March 2003, Aab was the representative in the Estonian Parliament (Riigikogu).

From July 2003 to April 2005, he was the executive director of the Association of Estonian Cities and Muncipilaties[2] (Eesti Linnade ja Valdade Liit), before Prime Minister Andrus Ansip appointed him to his cabinet in 2005.

[3] Since April 2007, Aab has been a representative of the Estonian Parliament and acting chairman of the Social Committee.