Sir Lynton Keith Crosby is an Australian political strategist, lobbyist, and co-founder of CT Group (Crosby Textor), widely recognized for orchestrating successful election campaigns for conservative parties in multiple countries. Born on 23 September 1956 in Yarram, a small town in rural Victoria, Australia, Crosby grew up in a farming community, which shaped his pragmatic approach to politics. He pursued higher education at the University of Melbourne, graduating with a Bachelor of Arts in 1977. Early in his career, Crosby joined the Liberal Party of Australia, rising through the ranks to become a campaign director. He was instrumental in John Howard's four consecutive federal election victories between 1996 and 2004, earning a reputation for data-driven strategies that emphasized wedge issues like immigration and national security.

In 2002, Crosby co-founded the CT Group (Crosby Textor), a political consulting firm, alongside Mark Textor, which quickly became a powerhouse in international conservative politics. The firm has advised campaigns in Australia, the United Kingdom, Canada, and the United States, including Michael Ignatieff's 2011 Liberal Party bid in Canada and John Key's National Party in New Zealand. In the UK, Crosby served as chief strategist for the Conservative Party, contributing to David Cameron's 2015 general election win and Boris Johnson's 2019 victory, for which he was knighted in the 2016 New Year Honours. Known for his 'dog-whistle' tactics—subtly appealing to voter prejudices without overt racism—Crosby has faced criticism from opponents for divisive strategies, such as the 'Go Home' vans campaign targeting illegal immigrants in 2013. He maintains professional networks with figures like American pollster Frank Luntz, facilitating cross-border influence in right-wing politics.

Beyond elections, Crosby's CT Group has expanded into public affairs and lobbying, representing clients in tobacco, mining, and healthcare sectors, raising questions about conflicts of interest in policy influence. Despite controversies, including allegations of undue foreign influence in UK politics, Crosby remains a key player in global conservative networks, blending Australian roots with international operations primarily based in London.