León Cosgrove Jiménez, LLP

León Cosgrove Jiménez, LLP is a law firm specializing in complex business litigation pending throughout the United States. There is no costly pyramid structure at León Cosgrove Jiménez. As a business, we are lean and un-leveraged to deliver better results at less cost.

Our lawyers, most of whom are former federal law clerks, were educated at top schools and trained at the world’s largest and most prestigious firms. They have spent their entire legal careers representing clients in some of the most complex lawsuits filed in the United States.

Our clients are our partners, with whom we will share risk in both plaintiff and defense cases all over the country. It’s the way we win.


Denver , CO

999 18th Street, #1200S Denver, CO 80202

Person of contact: Ronald Tomassi

Miami, FL

255 Alhambra Circle - Suite 800, Miami, FL 33134

Person of contact: Derek E. León

Houston, TX

700 Louisiana Street, Suite 5300, Houston, Texas 77002

Person of contact: Heaven Chee


Practice Areas

  • ADR/Arbitration
  • Banking and Finance
    • Banking Regulatory & Compliance
    • Bankruptcy and Credit Restructuring and Workouts
    • Collections and Foreclosures
    • Litigation
  • Class Action Defense
  • Construction
    • Litigation
  • Corporate
    • Internal Investigations
  • Defamation
  • Energy
    • Oil & Gas
  • Insurance
    • Litigation
    • Product Liability
  • Intellectual Property
    • Litigation
  • International Litigation
  • Labor & Employment
    • Arbitration
    • Litigation
  • Litigation/Trials
    • Administrative
    • Class Action
    • Construction
    • Consumer and Product Liability Litigation
    • Corporate/Commercial (Shareholder Derivative Suits, Securities, FINRA, Antitrust, Banking, Bankruptcy, etc.)
    • Criminal (White Collar)
    • Employment (HR, Discrimination, ERISA, Labor, Workers Comp, etc.)
    • Environment, Energy and Resources
    • Health and Healthcare Law
    • Insurance
    • International Law
    • Malpractice
    • Real Estate
    • Restaurant Retail & Hospitality
  • Privacy and Information Security/Cyber
    • Litigation
  • Products Liability
    • Litigation
  • Securities
    • FINRA Litigation
    • Litigation
  • Telecommunications
  • White Collar / Investigations
    • Compliance
    • Qui Tam
    • Regulatory Investigations

Firm Bio

About the Firm

León Cosgrove Jimenez, LLP is a litigation boutique, drawing its talent from the ranks of top-tier law firms such as Morgan, Lewis & Bockius, Hunton & Williams, Skadden Arps, DLA Piper, Ropes & Gray, Winston & Strawn, Boies Schiller & Flexner, White & Case, Hogan Lovells and other Am Law 100 firms. We have big firm experience and the corresponding work ethic without the big firm mentality and the conflicts that oftentimes constrain big firms. Many of our lawyers are former federal law clerks, and all of them have substantial expertise in high-stakes litigation. Our depth of experience and level of skill has resulted in clients such as J.P. Morgan Chase, Volvo Financial, McDonald’s, Merrill Lynch, UBS, Barclays, Spirit Airlines, Bed Bath & Beyond, and other Fortune 500 companies to engage our law firm. We have offices in Miami, Denver, Houston, Austin and New York City. 

Areas of expertise


Financial Services

Real Estate

Lender Liability


Intellectual Property

Energy Litigation 

Labor and Employment


Class Actions

Insurance Recovery

International Law and Arbitration

White – Collar Defense 

Government and Internal Investigations 


Chambers and Partners: “They zealously represent their clients. They are relentless, measured and effective and they act very collegially as a team.”

Scott Cosgrove and Derek León have been recognized individually by Chambers USA as leading individuals in litigation. The Firm has also been ranked by Chambers USA for its outstanding litigation practice, noting our experience in commercial, bankruptcy, and labor and employment litigation.

Founding Partner Scott Cosgrove was ranked in the “Top 100” of the several thousand attorneys selected for Florida Super Lawyers 2016. He also has been ranked as a top lawyer in commercial litigation by U.S. News & World Report Best Lawyers since 2015.

Founding Partner Derek León has been recognized by The Florida Bar, Hispanic Business magazine (top “Corporate Influential,”) Florida Trend magazine and the South Florida Business Journal.

U.S. News Best Law Firms has ranked León Cosgrove Tier One in bankruptcy & restructuring litigation in the Miami metropolitan area, and partner Andrew Zaron has been ranked a Best Lawyer for bankruptcy litigation and for bankruptcy and insolvency law. He has also been recognized by Chambers USA as a leading bankruptcy lawyer.

Significant Clients


J.P. Morgan Chase Bank, N.A.

CDR Creances, S.A.R.

Volvo Financial Services

McDonald’s Corporation

World Fuel Services

Atos Origin


Banco Sabadell 

 Contact – Derek E. León