Leadership
MESSAGE FROM OUR TYPSA US CEO.

SCOTT MCKENZIE
Welcome to TYPSA in the United States.
Our story began in Phoenix in 1992 as AZTEC, a small but ambitious SBE/DBE firm committed to delivering quality consulting services to public and private clients. From those early days, we have been fortunate to serve our clients and communities through advising, planning, permitting, and designing, to support building infrastructure that shapes how people live and move. What we achieved as AZTEC laid the foundation for who we are today, and we carry that legacy proudly as TYPSA in the US today.
Our growth has always been driven by two constants: the trust of our clients and the dedication of our people. Past and present, our employees have built a culture of integrity, collaboration, and excellence. What also has not changed is our approach: listening carefully to client needs, delivering cost-effective and sustainable solutions, and maintaining strong partnerships built on proactive communication and professional integrity. These values have allowed us to grow steadily and remain a trusted partner in communities across the United States.
Thank you for taking the time to visit our site. I invite you to connect with us and explore how TYPSA can help advance your projects and bring your vision to life.
TYPSA US MANAGEMENT BOARD
At TYPSA, our reputation is built on knowledge, integrity, and the consistent delivery of high-quality service. In the United States, we lead with a collaborative model of senior leadership.
Our Management Board is responsible for setting the overall strategy of the firm. Working in close partnership with our practice leaders, principals, discipline leads, and other senior staff, the Board guides the growth of our practices to better serve our clients and communities.
Across the organization, we foster a culture of entrepreneurship—encouraging innovation, collaboration, and accountability. This spirit drives our commitment to service, quality, open communication, and ultimately, client satisfaction.

RAFAEL VALERO SIN
PRESIDENT

Scott McKenzie
Chief Executive Officer

Mark Chase
Chief Operating Officer

Curt Slagell
SENIOR VICE PRESIDENT

Karim Dada
SENIOR VICE PRESIDENT

Mike Shirley
SENIOR VICE PRESIDENT

KARA STRONG
SENIOR VICE PRESIDENT

JAVIER DAMIA-LEVY
SENIOR VICE PRESIDENT

CARLOS TARAZAGA
SENIOR VICE PRESIDENT
PRACTICE LEADERS

Tim Mahon
TRANSPORTATION

CARLOS TARAZAGA
RAIL & TRANSIT

MIKE SHIRLEY
ENVIRONMENTAL/ LANDSCAPE

JAVIER DAMIA-LEVY
ENERGY/CA&I

KARIM DADA
BUSINESS DEVELOPMENT

KARA STRONG
CORPORATE SERVICES

Tony Elley
Field Services

Ignacio De la Hera Sola
Digital Services