T.Y. Lin International

Jennifer Lee leads the global legal and compliance function for Dar Holdings USA, which includes T.Y. Lin International Group.

Jennifer has over 15 years of legal experience, including as senior in-house counsel at multiple engineering and construction (E&C) firms and as a civil litigator. She is responsible for all of the company’s legal and compliance affairs, including risk management, contracts, insurance, ethics and compliance, corporate governance, transactions and other legal matters.

She has a Juris Doctor from the University of San Francisco School of Law and a Bachelor of Arts from Vassar College. She is active in several national and local legal communities, including those promoting diversity and inclusion and construction law.

Maribel Castillo leads all aspects of T.Y. Lin International’s global marketing and communications functions, including corporate positioning, acquisitions integration, new media, public/media relations, and internal communications.

An integral member of the firm’s leadership team, Maribel’s vast experience in business development, brand management and communications targeted towards worldwide audiences has enabled her to develop strategic programs that forward T.Y. Lin International’s global business objectives and build market share. She also guides and supports the efforts of the firm’s marketing staff found across more than 50 offices worldwide.

A professional services marketer in the Architecture/Engineering/Construction (A/E/C) industry for over 20 years, Maribel is an active member of the American Council of Engineering Companies Society (ACEC), the Society for Marketing Professional Services (SMPS), and the International Association of Business Communicators (IABC). She also served on the Board of Directors of The Unity Council, a non-profit community development corporation in Oakland, California.

Maribel’s awards include SMPS National Marketing Communications Awards (Brochure, Book/Monograph, Internal Newsletter, Media Relations, Recruitment Communications, Social Media and Website categories). Her work has also garnered IABC Gold Quill Awards (Website and Publications categories), The American Business Award (Stevie Award, Website category), and Communicator Awards (Website, Print and Design, and Employee Publication categories).

Mark Ashley serves as T.Y. Lin International's Senior Vice President and West Region Director. Mark is a professional engineer with over 30 years of experience in the planning, design, construction and maintenance of transportation projects.

His broad background covers bridge, highway, transit, rail, pedestrian and bicycle infrastructure and he has a strong technical foundation in structures. Mark began his career with the California Department of Transportation where he served as a bridge engineer.

In the area of transportation project development, Mark has a proven track record as an accountable and reliable project manager with a strong working knowledge of the various technical disciplines involved and proficiency in effective project control processes. Mark possesses strong communications and leadership skills which help foster a synergistic team environment. He has been responsible for delivery of transportation projects with values exceeding $100 million. Mark currently provides Program Management Oversight to the California High Speed Rail Authority for this high-profile project that will service residents statewide.

Mark is an active contributor to the community and continues to serve in leadership capacities in numerous organizations. He is Past President of the San Diego Section of ASCE and the San Diego Highway Development Association and served as chair of the ACEC/Caltrans Structures Liaison Committee for over 10 years.

A proven executive leader with over 30 years of comprehensive experience in the engineering field, Matthew (Matt) G. Cummings serves as President and Chief Executive Officer, overseeing the strategic direction and market growth of T.Y. Lin International’s global operations.

Matt holds a leading role under the infrastructure pillar of T.Y. Lin International’s parent company, the Dar Group. He has direct responsibility for leveraging and uniting the technological expertise of the firm and its sister companies to form an expanded, global presence.

In addition to his professional roles, Matt has held important industry leadership positions. These include serving as past Chairman of the American Road & Transportation Builders Association (ARTBA) and as past President of the American Council of Engineering Companies of Pennsylvania (ACEC/PA).

Sajid Abbas specializes in the design and analysis of long-span bridges in areas of high seismicity, applying his extensive knowledge of the design of iconic bridge structures in the United States, Asia, and the Middle East.

Sajid earned his Ph.D. from University of California at Berkeley with emphasis on the design of cable-supported bridges. His training is in bridge design, earthquake engineering and linear and nonlinear analysis of long-span bridge structures. Sajid is also an expert in bridge dismantling, having worked with the California Department of Transportation on several dismantling projects for the original San Francisco-Oakland Bay Bridge.

Joining T. Y. Lin International in 1994, Sajid’s portfolio of work for the firm spans the globe and ranges from network arch to concrete segmental and cable-supported bridges. His mastery of segmental design and construction is evidenced by such projects as the award-winning Skyway component of the San Francisco-Oakland Bay Bridge New East Span and the New Benicia-Martinez Bridge, both located in high seismic zones in California, as well as the Jamuna Multipurpose Bridge in Bangladesh - the first bridge in the country’s history to cross the Jamuna River.

Sajid is a member of the American Society of Civil Engineers and the American Institute of Steel Construction.

Tony Peterson has 36 years of experience in the architecture and engineering industry. In his role as President of T. Y. Lin International Group Ltd., Tony has direct responsibility for the firm's operations in China and Southeast Asia.

Tony is a member of the Board of Directors and he plays a significant role in setting the strategic direction of the T.Y. Lin International companies. Tony is directly involved in the acquisition of domestic and international companies for T.Y. Lin International and T.Y. Lin International's sister companies as well.

Veronica Fennie, Chief Accounting Officer, is responsible for overseeing all accounting functions for T.Y. Lin International.

With more than 25 years of experience overseeing all aspects of accounting and finances for architectural and engineering firms, Veronica brings a wealth of knowledge, specifically the integration of accounting and finance systems for small and midsize consulting firms. A multi-lingual speaker, she is a member of the Bay Area Financial Officers Group and American Management Association.

Bill Harnagel serves as Chief Financial Officer for T.Y. Lin International Group Ltd. In his role, he is responsible for planning, implementation, management, and control of all of the firm’s financial-related activities, both domestic and international.

A strategic finance professional with over 20 years in the A/E/C industry, Bill’s extensive leadership experience includes planning, analysis, forecasting, financial reporting, accounting, compliance, controls, and operational finance for both large and small organizations.

Bill is a Certified Public Accountant and a Certified Management Accountant, and is a member of the American Institute of Certified Public Accountants.