In addition to the insurance and financial services sectors, Gary has advised oil, mining, natural resources, media, computer services, recruitment, TV and film production, shipping, aviation, technology, cable and telecommunications companies.

He specialises in corporate finance; with experience of flotations and IPOs on securities markets, public company takeovers, rights issues, placings and open offers, vendor placings and venture and other capital investments advising issuers, investment banks, nominated advisers and stockbrokers.

He has extensive experience of acquisitions and disposals of private companies and businesses ("M&A"), joint ventures, group reorganisations, management, buyouts and general corporate matters such as shareholders agreements, capital reductions, schemes of arrangement, group restructurings and repurchase of shares. 

He has practised in the AIM Market since its inception in June 1995 and has given a number of international presentations on AIM with the London Stock Exchange in the UK, the US, India, Canada and Scandinavia and regularly gives advice to companies wishing to raise capital.  He is a member of the board of directors of the Quoted Companies Alliance (a City organisation dedicated to championing the interests of small to mid-sized quoted companies). Between 2013 and 2017, he was the Chairman of the QCA's Legal Expert Group. Among other things, he has been involved in numerous consultations relating to revisions to the AIM rules and the City Code on Takeovers and Mergers as well as the implementation of the EU's Market Abuse Regulation. He is currently lobbying the EU Commission on the reform of prospectus legislation against the background of BREXIT.

He is described in the Legal 500 as a "key player on the corporate side" and provides "clear, concise advice on complex issues", "a powerful force in getting a deal done" and "sharp, business focussed and pragmatic".