He joined the Indian Police Service in 1994, and later, obtained an MA in Public Policy from the University of British Columbia, Canada (2014-2016).

Project Seva 100 In 2008, in Aligarh Arun initiated a professionally run police helpline 100 system.

Highly acclaimed for its robust processes and assured response time, it introduced a new manner of functioning.

[8][9][10][11][12] On January 8, 2022 Arun announced that he would leave the IPS and begin a political career with the Bharatiya Janata Party.

He surprised everyone by visiting his rival candidate, Anil Doharey of Samajwadi Party, right after the announcement of the result, a courtesy rarely seen in Indian politics.

In 2016, he completed a Masters in Public Policy at the University of British Columbia, Vancouver, Canada, while on study leave from the Indian Police Service.

At the University of British Columbia he was very active with the Centre for India and South Asia Research (CISAR).