Julian Roger Hallam[1] (born 1965/1966)[2] is an environmental activist who co-founded Extinction Rebellion,[3][4] Just Stop Oil,[5] Insulate Britain,[6] the cooperative federation organisation Radical Routes,[7] and the political party Burning Pink.

[10] At age 18 Hallam travelled to India as part of the Student Christian Movement to work with civil rights groups in Raipur.

[14] He was previously an organic farmer on a 10-acre (4-hectare) smallholding near Llandeilo in South Wales; he attributes the destruction of his business to a series of extreme weather events.

[15][16] Between at least 2017 and early 2019, he was studying for a PhD at King's College London,[17] researching how to achieve social change through civil disobedience and radical movements.

[18] Hallam appeared at Bow Street magistrates for daubing anti-nuclear peace messages on the Ministry of Defence building on Ash Wednesday in 1987.

[22] Hallam with Stuart Basden, Ian Bray and Genny Scherer were prosecuted and some pledged to go on hunger strike if imprisoned.

[26] In September 2023, Hallam was ranked thirty-fourth on the New Statesman's Left Power List of influential left-wing figures in the UK.

[29] Five weeks after the first protest, the university removed £14 million worth of investments from fossil fuel companies and pledged to become carbon neutral by 2025.

Campaign, who were critical of the tone of his language but lauded him for his honesty and his willingness to highlight the crimes which colonial powers committed in Africa.

[39] Hallam and four other activists were arrested on suspicion of conspiracy to cause a public nuisance on 12 September 2019, the day before a planned action to pilot drones in the exclusion zone around Heathrow Airport in order to disrupt flights.

[44] The jury trial took place in London and was marked by outbursts from the defendants after a ruling from Judge Christopher Hehir prohibiting them from using climate breakdown as a defence for their actions.

[47][48] On 18 July 2024, at Southwark Crown Court, Hallam was sentenced to five years' imprisonment while the other four defendants each received four-year jail terms.