Professional and ethical standards allied with pragmatism for efficient results

01. Law firm founded by partners with twenty years of specialist expertise in state aid from the regulators to private practice

02. Direct advice from a partner backed by a small team of committed professionals

03. First-hand knowledge of the decision-making process within the EU institutions and the EEA

04. Wide network of contacts within the European institutions (Commission and EFTA Surveillance Authority)

05. Legal advice in English, French, German, Spanish

The founders

Maria Segura

Member of the Brussels Bar (Liste E) and Madrid Bar

Phone    +32 2 769 23 82

Mobile phone    +32 486 47 53 75



Former Deputy Director of the Competition and State Aid Directorate of the EFTA Surveillance Authority. Maria Segura has worked exclusively on state aid matters since 2002, acquiring a wide-ranging experience in assessment and litigation.

Education: Universities of Zaragoza, Pau, Vienna and Europa Institute of Saarbrücken

Member of FIDE and EVER Alumni

Marianne Clayton

Member of the Paris Bar and Brussels Bar (Liste E)

Phone    +32 2 769 23 81

Mobile phone    +32 473 93 57 93



Former senior officer at the Competition and State Aid Directorate at the EFTA Surveillance Authority. Marianne Clayton has over 15 years of state aid experience within the regulators and major international law firms.

Education: Universities of Kings College and Paris I – Sorbonne

Member of FIDE and Kings College Alumni


  • Clayton & Segura welcomes spontaneous applications from both junior and senior lawyers.

  • Applications for traineeships for a duration of 3 to 6 months are welcome at any moment throughout the year.