He worked in the government as a foreign service officer and later became an advisor to Acting President Thomas Remengesau.

[5] On March 9, 2006, the Governor of Peleliu Jackson Ngiraingas asked the Senate of Palau to conduct an investigation into numerous allegations of conflicts of interest against Shmull and other politicians.

[7] In March 2014, former Palauan politician Joshua Koshiba called for the removal of Shmull as vice president of the Palau National Olympic Committee though he would be reconfirmed in his position in February 2017.

[11][12] In April 2019, to commemorate International Mine Awareness Day, Shmull announced that he believed the presence of anti-personnel landmines had been eradicated from the state.

[14] He stepped down due to the term limits of the constitution of Peleliu and was succeeded by Emais Roberts, who he endorsed, in January 2022.