Mario Oller
About Mario Oller
Mario Oller is a lawyer based in Barcelona, ES and has been recognized in The Best Lawyers in Spain™ since 2024. Mario Oller is recognized in the following practice area:
- Barcelona, Spain
- Litigation
Current Firm: OBN&
Location: Barcelona, ES
Nearby Lawyers
He graduated in Law at the University of Barcelona. Since 1,990 He is a lawyer member of the Barcelona Bar Association. He took postgraduate courses in Town Planning Techniques, in Reparcel Land Systems, and in Cadaster and Real Estate Taxation at the Catalonia Polytechnique University. He has developed a wide professional career for 30 years practicing mainly in administrative law and real estate. His expertise is in town planning, compulsory purchase, public licenses, public domain, Public ...
Graduate in Law, Universitat Autònoma de Barcelona (1991). Postgraduate Degree in Real Estate Law and Land Use and Planning, Universitat Pompeu Fabra (1992). Member of the Universitat Pompeu Fabra Administrative Law Department from 1991 to 1999. During those years she completed the PhD courses in Public Law (1992-94) and carried out legal teaching and research activities. In 1995 she presented a dissertation on the system for the recognition of professional qualifications in the Europe...
Francesc Valdivia is a top attorney recognized by Best Lawyers in the practice area(s) of Administrative Law. Francesc, who practices law in Barcelona, Spain, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Francesc is held by other top lawyers in the same geographic and legal practice area.
Xavier graduated in law from the Universidad Autònoma de Barcelona (1987). He gained a Postgraduate Diploma in European Union Law from the Barcelona College of Lawyers (1994). He joined Pareja& Associats, Advocats in 1986 and he has worked as a lawyer with the firm since then. During his time with the company he has gained extensive professional experience as a legal adviser negotiating contracts and agreements, preparing spatial planning and urban management tools and providing de...
Max joined Crowe Tax & Legal in 2003 and has since then been Senior Partner and Head of the Labor Law Department in Barcelona. Max provides advice to companies in the process of staff restructuring, changing working conditions and collective bargaining. In addition, he is also a socio-occupational auditor and took part in operational due diligences, labor compliance development of variable remuneration systems and implementation of gender equality. He has also wide experience in litigatio...
Miriam Clapés Oleart is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation. Miriam, who practices law in Barcelona, Spain, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Miriam is held by other top lawyers in the same geographic and legal practice area.
Graduate in Law, Universitat Autònoma de Barcelona (Hons, 1988). Graduate in Arts, Universitat Autònoma de Barcelona (1987). Master’s Degree in Local Administration, Universitat Autònoma de Barcelona – Institut d’Estudis Metropolitans (1990). Postgraduate Degree in Real Estate Law and Land Use and Planning, Universitat Pompeu Fabra (1991). Doctor of Law cum laude, Universitat Pompeu Fabra (2001). Member of the Federation of Catalan Municipalities Legal S...
Albert graduated in law from Barcelona University (1996) and gained a Postgraduate diploma in Real Estate Law and Urban Planning from Pompeu Fabra University-idEC (2000). He went on to gain a Master’s in Land Useand Urban Planning Studies at the Public Administration School and he qualified as an Urban Planning Technician UPC-UPF (2001-2003). He also has a Postgraduate Diploma in Environment and Natural Resources from Pompeu Fabra University–IDEC (2004), and another in the special...
Degree in Economics from Universidad de Barcelona. She holds an Executive Master in taxes by ESADE. She has more than 15 year’s professional experience with tax consulting. She has wide experience in International Assignment Services, design and implementation of Compensation and Benefits Plans, definition of Compensation programs for Senior Executives, etc.
Javier Vidal-Quadras Trías de Bes jvq@avqlegal.com Partner in charge of the Civil Law and Litigation Area Education: Graduate in Law (1984) from the University of Barcelona. Professional experience and expertise: I am the co-founding partner of the firm and head of the Civil and Procedural Law department. My main activity is focussed on litigation and arbitration of contractual content, agency and distribution, inheritance and wills, mortgage, competition law, corporate lawsuits and la...
Explore and Learn
2026 Best Lawyers Awards: Recognizing Legal Talent Across the United States
by Jamilla Tabbara
The 2026 editions highlight the top 5% of U.S. attorneys, showcase emerging practice areas and reveal trends shaping the nation’s legal profession.
Gun Rights for Convicted Felons? The DOJ Says It's Time.
by Bryan Driscoll
It's more than an administrative reopening of a long-dormant issue; it's a test of how the law reconciles the right to bear arms with protecting the public.
2026 Best Lawyers Awards in Canada: Marking 20 Years of Excellence
by Jamilla Tabbara
Honoring Canada’s most respected lawyers and spotlighting the next generation shaping the future of law.
How to Sue for Defamation: Costs, Process and What to Expect
by Bryan Driscoll
Learn the legal standards, costs and steps involved when you sue for defamation, including the difference between libel and slander.
Best Lawyers 2026: Discover the Honorees in Brazil, Mexico, Portugal, South Africa and Spain
by Jamilla Tabbara
A growing international network of recognized legal professionals.
The Family Law Loophole That Lets Sex Offenders Parent Kids
by Bryan Driscoll
Is the state's surrogacy framework putting children at risk?
Holiday Pay Explained: Federal Rules and Employer Policies
by Bryan Driscoll
Understand how paid holidays work, when employers must follow their policies and when legal guidance may be necessary.
Unenforceable HOA Rules: What Homeowners Can Do About Illegal HOA Actions
by Bryan Driscoll
Not every HOA rule is legal. Learn how to recognize and fight unenforceable HOA rules that overstep the law.
How to Choose a Good Lawyer: Tips, Traits and Questions to Ask
by Laurie Villanueva
A Practical Guide for Your First-Time Hiring a Lawyer