People / Natalia Cosio
Cosio Ondiviela Natalia

Natalia Cosio Ondiviela *

Foreign Associate

* This Haynes and Boone professional is not licensed to practice law in the state of Texas.

Natalia Cosio Ondiviela is a foreign associate in the International Practice Group at Haynes and Boone focusing on administrative law, compliance and investigative work. Natalia has experience on regulatory compliance, including in the oil and gas industry in Mexico, with a clear understanding of the requirements and obligations throughout a project’s life cycle, as well as in a variety of subjects, such as the permitting sequences for onshore and offshore exploration and extraction operations, and midstream, downstream and retail requirements to obtain permits and operate oil and gas pipelines, tank cars and tank trucks, storage facilities, service stations (gasoline, diesel and multimodal stations), and develop transloading operations, among others.

Additionally, Natalia has been involved in conducting internal investigations and providing compliance advice. She also has experience in in cross-border transactional and mergers and acquisitions work, including due diligence research on regulatory compliance issues for companies in the U.S. and Mexico.

Prior to joining the firm, Natalia was the General Director for Legal Consultancy at the Agency for Safety, Energy and Environment (ASEA) in Mexico City where she provided comprehensive legal solutions for the development of oil and gas projects. During this time, Natalia was engaged in the rulemaking process for setting the new industrial safety and environmental protection standards, together with the safety and environmental management system guidelines, insurance policies, and environmental impact assessment requirements.

Selected Publications and Speeches

Show More
Professional Affiliations and Engagements
  • Young Energy Professionals Mexico (YEPMx)
  • ITAM Graduates Bar Association
  • New York City Bar Association
  • Member of the National Association of Women Lawyers (NAWL)


LL.B., Autonomous Technological Institute of Mexico, 2015

LL.M., Columbia Law School, 2019





Larry Pascal, Natalia Cosio Ondiviela in Latin America Advisor Q&A
August, 19 2021

Haynes and Boone, LLP Partner Larry Pascal and Foreign Associate Natalia Cosio Ondiviela participated in a Q&A in Latin America Advisor about the state of Pemex’s finances. Below is an excerpt: Q: Mexican state oil company Pemex last month posted a second-quarter net profit of $721 million, with crude production up 3.8 percent as compared to the same period a year ago. However, the firm’s financ [...]