Colin became the senior partner of Simmons & Simmons in 2011, but continues to maintain his litigation practice. Over the last 31 years Colin has worked in England, Hong Kong and the Middle East from where he has developed a varied commercial litigation practice that encompasses both international and domestic disputes. His particular focus areas are retail finance litigation, extradition disputes and large professional indemnity claims.
Colin published the 3rd edition of "Privilege" in July 2013. This is one of the leading textbooks on the subject of legal professional privilege. Colin also authors Passmore on Privilege: a blog, which reviews the more interesting cases arising under the law of legal professional privilege.
He joined Simmons & Simmons in 1986, becoming a partner in 1990 and a solicitor advocate (civil) in 1999. He is chairman of the Membership Committee of the Academy of Experts.
Colin is cited in Chambers UK 2016 as an Eminent Practitioner for Banking Litigation, Litigation: Elite and Professional Negligence. Colin is noted as ‘an excellent tactician with great technical ability and ‘[is] really good at giving commercial advice’. The directory notes he is ‘well- regarded by his peers’ and is a ‘recognised expert on legal privilege’. Colin is also listed as a leading individual in Legal 500 UK 2015 for Commercial Litigation and Professional Negligence; and is praised for his ‘in-depth experience’ in professional negligence.