Megumi Ryoya saw her future as a corporate lawyer during her senior year of college at Waseda University.
“I met an in‑house counsel at a well‑known Japanese manufacturer who told me that formal legal training and a bar license would significantly broaden what I could do professionally,” Ryoya told The Texas Lawbook. “That conversation became a turning point for me.”
“Around the same time, my understanding of law itself was deepening,” she said. “I came to see that law touches virtually every aspect of society and business, functioning as a kind of infrastructure that underpins decision‑making across industries. The idea that legal thinking could give me a broader, more connected view of the world convinced me that this was the field in which I wanted to build my expertise.”
Fifteen years later, Ryoya is senior counsel for legal and compliance at global powerhouse Mitsubishi Corporation, where she provides strategic leadership and advice for a large portfolio of energy and chemical businesses.
Despite being in her position for less than two years, Ryoya played a critical role during the past year in developing a joint venture agreement between Mitsubishi and ExxonMobil to develop the world’s largest low-carbon hydrogen project.
“During the period when Mitsubishi was actively evaluating participation, Megumi played an indispensable role in coordinating legal strategy across U.S. business teams, external counsel and key stakeholders in Japan,” said Vinson & Elkins partner Shay Kuperman. “She became the central point of alignment between jurisdictions, guiding discussions that required reconciling different legal frameworks, commercial expectations and institutional decision-making processes.”
Citing her achievements, the Association of Corporate Counsel’s Houston Chapter and The Lawbook are honoring Ryoya with the 2026 Houston Corporate Counsel Award for Senior Counsel of the Year for a Midsized Legal Department. The awards recognize lawyers who have been in-house for two years or less.
“Megumi has shown the ability to lead through ambiguity, to synthesize complex information across legal and cultural contexts and to support major strategic initiatives with maturity and poise,” said Kuperman, who nominated Ryoya for the honor. Her contributions to Mitsubishi’s evaluation of a first-of-its-kind hydrogen project alone demonstrate a level of sophistication and impact that is rare for early career counsel. But equally important is the consistency with which she shows up — reliable, thoughtful and deeply committed to advancing the company’s objectives while upholding the highest standards of legal practice.”
“As Megumi’s career trajectory has made clear, she is an outstanding lawyer and leader in the energy and corporate counsel community,” he said. “Her accomplishments and work have contributed meaningfully to shaping Mitsubishi’s role in the evolving global energy landscape.”
Premium Subscriber Q&A: Megumi Ryoya discusses the traits she seeks in outside counsel, what outside counsel need to know when working with her and more.
Mayer Brown partners Marcia Goodman and William Stallings say that Ryoya “has a rare blend of qualities that make her both a great lawyer and great in-house leader.”
“In her role, Megumi frequently needs to synthesize the complexities — and, at times, absurdities — of U.S. legal matters into clear and concise recommendations for her Japan-based in-house clients to consider,” Goodman said. “In doing so, she never misses the true substance of what is at stake. Her razor-sharp intellect allows her to deftly analyze the most challenging of legal issues. She demonstrates an incredible poise under pressure that provides her an edge in negotiations with counter-parties. Her calm approach underlies the conviction in her decisions.”
Ryoya was born and raised in Kumamoto, a regional city in Japan. She moved to Tokyo to attend Waseda University and study law.
Neither of her parents attended college. Both started jobs immediately after high school at a local post office, where they became postmasters.
“While their educational paths were very different from mine, I continue to be influenced by their strengths — my father’s sharp, logical thinking and my mother’s broad perspective and ability to understand people and situations,” Ryoya said.
Ryoya had no lawyers or legal professionals in her family.
“Becoming a lawyer was a path I chose independently,” she said. “That said, my parents were always fully supportive of my decisions. They encouraged me to pursue both college and law school, making it possible for me to follow my interests without hesitation or financial concern.”
Ryoya earned her law degree from Kyoto University in 2011.
“What truly shaped my career path was my exposure, during law school, to practicing attorneys who taught as adjunct professors while remaining deeply involved in real‑world corporate work,” she said. “They demonstrated how legal knowledge, when used strategically, could help clients navigate unprecedented transactions, influence policy and create tangible outcomes.”
“Seeing how abstract legal principles could be connected and applied as practical tools was compelling to me,” she said. “It reinforced my belief that developing strong legal fundamentals would allow me to contribute meaningfully to complex business and societal challenges.”
From 2012 to 2020, Ryoya worked as a corporate transactional associate at Nishimura & Asahi, a Tokyo-based corporate law firm with more than 900 legal professionals.
She joined the legal department at Mitsubishi Corporation in 2020.
“My interest in Mitsubishi Corporation was first sparked through conversations with close friends who spoke highly of the work and breadth of matters handled by its legal department,” she said. “I later had the opportunity to work with Mitsubishi through a secondment, which allowed me to see the role of in‑house legal firsthand.”
In 2024, Mitsubishi assigned Ryoya to its Houston office.
“One of the greatest challenges has been the need to continuously adapt to new business areas and legal issues as part of a global trading company,” Ryoya said. “This has been particularly true since starting to work on U.S.‑related matters.”
In the U.S., business activities involve not only traditional trading but also new projects and business development,” she said. “Addressing legal risks requires careful consideration of differences in legal systems, litigation environments and broader social and cultural contexts between Japan and the United States. I see my role as helping translate those differences into practical legal guidance that supports informed business decisions.”
Ryoya said she handles about 10 projects at any given time, in addition to two to three general legal inquiries and contract matters per week and five to 10 litigation matters.
Stallings at Mayer Brown said that Ryoya “sees around corners.” He points to an article Ryoya co-authored in 2017 called “Law and Strategy of the Internet of Things and Artificial Intelligence.”
“Megumi doesn’t take anything for granted. She immediately sees what the open questions are and what really matters to the client and makes sure she gets those answers from outside counsel or inside teams,” Stallings said. “She is quick and no-nonsense in obtaining the right information across what might otherwise be the internal barriers that every organization has. Megumi’s voice is heard among her U.S. legal colleagues, as well as her Japanese legal colleagues and her U.S. and Japanese business clients. Everyone knows they can count on Megumi to let them know exactly what is happening and what they need to do.”
But Ryoya really established her credentials as a leading international corporate transactional lawyer in Mitsubishi’s joint project with ExxonMobil involving the energy giant’s Baytown facility.
Both companies call it an “unprecedented project,” expected to produce up to one billion cubic feet per day of virtually carbon-free hydrogen, with approximately 98 percent of associated CO₂ captured and stored.
“No commercial hydrogen development of this magnitude exists today,” Kuperman said. “The deal itself was extraordinary in scope and complexity.”
Kuperman, in nominating Ryoya for the award, said that her “effectiveness as a liaison between U.S. legal advisors and Japanese decisionmakers” proved critical.
“Megumi distinguished herself by translating complex U.S. legal concepts, regulatory timelines and risk assessments into structures that supported clear, informed review by Japanese headquarters,” Kuperman said. “Her ability to anticipate questions, bridge cultural and regulatory perspectives and maintain momentum during a critical evaluation phase was instrumental in advancing the transaction.”
“Structuring a transaction around a project that is effectively defining the frontier of the hydrogen economy required navigating untested commercial models, long term offtake structures and technology performance assumptions that will influence hydrogen markets for decades,” he said. “What made Megumi’s work even more distinctive is the cross-border nature of the project.”
Kuperman said the project “creates a new energy corridor between Texas and Japan” by “coordinating infrastructure development, shipping logistics and regulatory approvals across two national energy systems introduced layers of complexity rarely seen in traditional energy transactions.”
Ryoya told The Lawbook that Mitsubishi has been “actively engaged in next‑generation and low‑carbon energy‑related businesses as part of broader energy‑transition initiatives” in North America.
“Cross‑border investment projects generally face significant regulatory and political uncertainty, and this is especially true for large‑scale energy‑transition initiatives,” she said. “In addition to U.S. law, developments in other jurisdictions can materially affect project feasibility and risk. My role has been to fully understand the commercial objectives and sources of competitive advantage, assess potential risks under multiple scenarios and clearly identify which issues are critical for management decision‑making.”
“Maintaining close alignment between internal stakeholders and outside counsel, and serving as a central connection point between the two, has been essential to navigating these complexities effectively,” Ryoya said. “In‑house legal work is inherently collaborative, and seeing the combined efforts of business teams and corporate specialists take shape is deeply rewarding.”
Kuperman said that Ryoya has distinguished herself as “an exceptional emerging corporate counsel whose impact far exceeds her tenure.”
“In a short period, Megumi has become a trusted advisor within Mitsubishi Corporation, contributing meaningfully to some of the company’s most complex and strategically significant energy and chemicals matters,” he said. “Her accomplishments reflect not only technical excellence, but also judgment, cross cultural fluency and the ability to lead through complexity.”
“Against this backdrop, Megumi’s leadership, judgment and cross-cultural fluency were essential,” Kuperman said. “Her ability to guide a first of its kind transaction through a complex internal and external landscape exemplifies the sophistication, maturity and impact that define a standout [Senior Counsel of the Year].”
Fun facts: Megumi Ryoya
- Favorite book: Houston Then and Now by William Dylan Powell. It compares photographs of Houston from 100 to 150 years ago with the present day and has helped me feel the city’s history, even as a newcomer.
- Favorite movie: The Devil Wears Prada and The Intern. Both give me energy and motivation to pursue meaningful work.
- Favorite drink: Hot cocoa made with soy milk. If alcoholic drinks are included, I also enjoy beer — especially Saint Arnold beer, a well‑known local brewery in Houston.
- Favorite restaurant: Zen, a Japanese izakaya in Houston. I love Houston’s food scene, but I still miss Japanese flavors from time to time.
- Favorite all-time vacation: Going to live music shows — whether alone or with friends.
- Hero in life: My older sister. We have chosen very different life paths, but she always offers unexpectedly sharp and insightful advice when I am uncertain.