Matthew S. Okin

Debra S. Casaceli is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Debra S., who practices law in Houston, Texas, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Debra S. is held by other top lawyers in the same geographic and legal practice area.

Jeffrey C. Londa is a nationally recognized labor and employment lawyer. His practice focuses on all aspects of labor and employment law, including complex employment litigation, class/collective actions, collective bargaining and arbitrations. Mr. Londa has considerable experience representing government entities, including public transit authorities. Mr. Londa is Board Certified as a labor and employment law specialist by the State Bar of Texas.Comments of others, particularly clients, best...

David L. Tolin is a top attorney recognized by Best Lawyers in the practice area(s) of Insurance Law. David L., who practices law in Houston, Texas, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David L. is held by other top lawyers in the same geographic and legal practice area.

Nicholas Diamond is a top attorney recognized by Best Lawyers in the practice area(s) of Health Care Law. Nicholas, who practices law in Houston, Texas, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nicholas is held by other top lawyers in the same geographic and legal practice area.

Ryan is a Trial Lawyer who’s recovered the largest verdicts and settlements in history for clients who were catastrophically injured, seriously burned, and tragically killed across Texas, Louisiana, New Mexico and the United States. His record-setting verdicts and settlements have received national media attention and distinguished Ryan as one of the top personal injury lawyers in the country. Since founding the firm, Zehl & Associates has repeatedly recovered the largest verdicts a...

Andrew Calder is a partner in the Houston and Austin offices of Kirkland & Ellis LLP where he also serves as a member of the Firm’s Executive Committee. His practice focuses on mergers and acquisitions, corporate and securities law, and corporate governance, with a particular focus on the energy sector. Andrew is recognized in Chambers Global, Chambers USA, America's Leading Lawyers for Business for Energy: Oil & Gas (Transactional) 2015–2022, Corporate/M&A 2016–...

Brian E. Simmons focuses on all facets of intellectual property law, including patent and trade secret litigation; patent counseling; due diligence investigations for investments, acquisitions, and divestitures; technology transfers, joint developments, and other research agreements; licenses; transactions involving IP; and risk consulting. Mr. Simmons has represented clients in a variety of matters in the chemical arts after serving as a senior research chemist prior to practicing law. His e...

John is a Director in the Real Estate Section. His practice involves the representation of clients in matters related to real estate development, banking, corporate/partnership matters and special purpose districts used to finance development, including municipal utility districts, levee improvement districts, and tax increment financing districts. He has also represented clients in connection with negotiating Chapter 380 and Chapter 381 development agreements with both cities and counties in...

Hugh M. Ray III is a top attorney recognized by Best Lawyers in the practice area(s) of Energy Law and Oil and Gas Law. Hugh M., who practices law in Houston, Texas, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Hugh M. is held by other top lawyers in the same geographic and legal practice area.

Mark C. Evans is a top attorney recognized by Best Lawyers in the practice area(s) of Banking and Finance Law, International Trade and Finance Law and Project Finance Law. Mark C., who practices law in Houston, Texas, has been recognized since 2006. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mark C. is held by other top lawyers in the same geographic and legal practice area.