Answer
Sigurður Ingi Jóhannsson succeeded Sigmundur Davíð Gunnlaugsson as leader of the Progressive Party. This transition occurred as a result of Gunnlaugsson's involvement in the Panama Papers scandal, leading to his resignation in April 2016. Jóhannsson, previously serving as Minister of Fisheries and Agriculture, assumed the role of party leader to guide the Progressive Party through this period of transition and address the concerns raised by the scandal.