Michael Castiel

People and companies trust us with their livelihoods, their businesses, their futures and I never lose sight of this. I consider it an honour to be trusted like that and everything I do is simply about living up to that trust.



Telephone Number

+350 200 79000


English, Spanish, French, Portuguese

Michael is a former senior partner of the Firm and continues to assist the team as a Consultant on cross-border corporate and tax structuring for global corporate groups and international institutions.

Michael specialises in international tax, corporate and business law regularly advising major US, Canadian and European multinationals and his expertise extends to corporate structuring and restructuring, joint ventures, mergers and acquisitions as well as reorganisations and insolvency having previously advised both receivers and liquidators in a number of high profile cases.

Michael first studied business administration and management and worked in UK industry for eight years after which he studied law at East London University and at the Inns of Court School of Law and was called to the English and Gibraltar Bar in 1993.

Chambers Global:
"Very able and knows what he is talking about"; "solution-focused"; "provides sound advice"; "gives me advice in real language and not legalese." (2020 Edition)
"Castiel is my go-to person when I need something related to commercial law." (2019 Edition)
"He has a commercial mind and advises on not just the legal side but also on the commercial aspects.' (2016 Edition)
"He is articulate and explains things well, which makes him easy to work with…he makes sure that everything is taken care of extremely quickly and that it's being done at the right level internally." (2015 Edition)
Legal 500:
Hall of Fame Leading Lawyer (EMEA 2020)
"Specialises in international tax, corporate and business law. Michael’s expertise also extends to corporate restructuring, joint venture work, mergers and acquisitions, franchising law and insolvency, often advising both receivers and liquidators in high profile cases" (EMEA 2019)
.'Knows his stuff.' (EMEA 2016)
‘A confident leader in the field who has an amazing aptitude to solve complex commercial problems’. (EMEA 2015)