[3][2] In March 2019, Ullah travelled to Geneva to address the United Nations Human Rights Council on behalf of the Rohingya in Bangladesh.

In November 2014, he met with US President Barack Obama when he visited Myanmar, and expressed concern about the country's treatment of ethnic minorities.

[2] Ullah met with a group of community leaders and established ARSPH shortly after arriving at Cox's Bazar.

Second, to build a community of leaders within the camp to advocate for Rohingya human rights and genuine democracy in Myanmar.

[9] To document these crimes, ARSPH volunteers walked door-to-door in the camp to find out who had family members who had been killed and who had suffered or witnessed other outcries such as torture, rape, and the burning of homes and villages.

[11] In March 2019, Ullah travelled to Geneva with another Rohingya leader, Hamida Khatun of the women's organization Shanti Mohila, to address the UN Human Rights Council.

"[12] In July 2019, Ullah travelled to Washington DC, where he was one of a group of refugee victims of religious persecution to meet with US President Donald Trump.

Bangladeshi police have charged 29 people over the murder, some of whom are members of the militant group the Arakan Rohingya Salvation Army (ARSA).

[23] The Bangladesh Police stated in March 2022 that he had been murdered by the Arakan Rohingya Salvation Army who saw his increasing popularity as a threat.

[24] An investigative report submitted to a court in Cox's Bazar in June 2022 accused ARSA's leader Ataullah abu Ammar Jununi of ordering the murder because he feared Mohib Ullah and his organization Arakan Rohingya Society for Peace and Human Rights's popularity, which he believed could be an impediment in ARSA's operations.

The police also stated that he had told Mohib Ullah to shut down the operations of his organization and join ARSA, but he refused.