Born in Kolkata in 1961, O'Brien spent his early years immersed in the world of quizzing. He rose to fame as the host of the popular Bournvita Quiz Contest, captivating audiences with his knowledge and charisma. This early experience honed his communication skills and ability to think on his feet, skills that would later prove invaluable in the political arena.

In 2011, O'Brien took the plunge into politics, joining the All India Trinamool Congress and getting elected to the Rajya Sabha from West Bengal. Since then, he has become a prominent voice for the TMC, serving as the party's chief national spokesperson and parliamentary leader in the Rajya Sabha.

O'Brien's style of politics is far from conventional. He is known for his articulate and often combative interventions in parliamentary debates, fearlessly questioning the government on issues ranging from economic policies to human rights violations. His speeches are infused with wit and sarcasm, leaving opponents flustered and his own party colleagues cheering.

He is a master of using social media to amplify his message, engaging in lively online debates and using humor to expose what he sees as the government's failures. His Twitter handle, @derekobrienmp, is a treasure trove of sharp quips, political commentary, and witty exchanges with fellow politicians.

However, O'Brien's outspokenness has also landed him in trouble. He has been suspended from the Rajya Sabha several times for disruptive behavior, accused by some of theatrics and grandstanding. His supporters, however, see him as a fearless fighter for what he believes in, unafraid to stand up to power and hold the government accountable.