Frankfort, Kentucky (December 3, 2023) – HMB Professional Engineers, a Kentucky-based engineering firm,
is thrilled to announce the add-on acquisition of Corn Island Archaeology, LLC (CIA). The acquisition gives
HMB cultural historic and archaeological services, making HMB’s environmental division a full-service
enterprise that can bring turnkey environmental solutions to its clients.

“We are delighted to have Corn Island join the HMB team,” said HMB President Rob Dowler. “The addition
of Anne Bader and her outstanding group of cultural historic and archaeological professionals will enable
HMB to provide a full suite of environmental services to better serve our clients.”

Corn Island Archaeology is Kentucky-based premier provider of archaeological and cultural historic services.
CIA partners with their clients, attending to their needs to develop the appropriate strategies and solutions
for each unique project. CIA provides a full range of surveys, research and documentation to satisfy all the
Cultural Resource s Management (CRM) requirements for their clientele.

“I am so very pleased to join the HMB/Trilon organization,” said Anne Bader, Principal of Corn Island
Archaeology. “I have worked with HMB for years, and in the last year I have gotten to know their leadership
on a more personal level. I am completely satisfied and comfortable in the knowledge that my employees
will find themselves in a work environment that is so similar to our own. Further, I am convinced that my
practice will continue seamlessly and that the interests of my valued and longstanding clients will be met
with the same level of care as before. Looking forward to exploring expanded opportunities to better serve
our state and local governments, private developers, and communities.”

Founded in 1979, HMB is a leading provider of engineering services to state and local agency clients
throughout the southeast. HMB sees the opportunity to better serve our infrastructure clients with the
addition of the talented staff of CIA.

“After years of partnering with Anne and her staff at Corn Island, we are thrilled to bring them into the HMB
family,” said Michael Leathers, Principal-in-Charge of Environmental at HMB. “Together we can offer
tremendous value to our clients by covering all aspects of the environmental process. We are excited about
the opportunities ahead!”

HMB is a part of the Trilon Group, a family of companies focused on growing infrastructure capabilities to
better serve our clients through investments in talent, technology and targeted mergers and acquisitions.
The Trilon Group, which is backed by people-driven private equity firm Alpine Investors, seeks to build the
next Top 10 design firm in North America by bringing together the nation’s best infrastructure consulting
firms and by investing in those firms to accelerate growth and careers of their employees.

About HMB Professional Engineers

HMB is a premier provider of engineering services primarily focused on state and local agency clients in the
transportation, water and environmental markets. Headquartered in Frankfort, Kentucky, HMB also has
offices in Lexington, KY, Nashville, TN, New Albany, IN, Montgomery, AL, and Marianna, FL. HMB was founded
in 1979 and has over 100 employees across its 6 offices. For more information, visit

About Corn Island Archaeology

Established in 2005, Corn Island Archaeology, LLC (CIA) is a woman-owned small business providing CRM
services. Based in Louisville, Kentucky, CIA’s staff is qualified in all phases of Native American and historic
archaeology of the eastern and midwestern U.S. in accordance with professional standards and guidelines of
the Secretary of the Interior. CIA serves a region defined by the drainage basin of the Ohio River. Primarily
focused on Kentucky, Indiana, and Tennessee, CIA readily supports clients and communities within the
adjacent states of Ohio, Illinois, and West Virginia. CIA’s archaeological professionals are registered with the
Register of Professional Archaeology (RPA) and adhere to their professional and ethical standards.

About Trilon Group

The Trilon Group was formed with a vision to build the next Top 10 design firm in North America by bringing
together some of the nation’s best infrastructure consulting firms. Key focus areas include Transportation,
Water, Utilities, Environment and Community Infrastructure. Trilon Group has welcomed 17 partnerships to
date and collectively employs over 3,900 employees. For more information, visit

About Alpine Investors

Alpine Investors is a people-driven private equity firm that is committed to building enduring companies by
working with, learning from and developing exceptional people. Alpine specializes in investments in
companies in the software and services industries. Its PeopleFirst strategy includes a talent program that
allows Alpine to bring leadership to situations where additional or new management is needed posttransaction. Alpine is investing out of its more than $4.5 billion ninth fund. For more information, visit

For Trilon Inquiries
Johnny Heller, Corporate Development

For HMB Inquiries
Rob Dowler, President

For Media Inquiries
Audrey Harris, Head of Marketing