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The NASTT Board of Directors manages the affairs of the Society, on behalf of NASTT and its membership.


The NASTT Board of Directors manages the affairs of the Society, on behalf of NASTT and its membership. The Board is comprised of 19 directors, who are elected by the Society’s members. Only elected Directors may serve as Officers of the Society and are appointed by the Board of Directors. Click on each name to read their complete bios and to learn more about the organizations they work for.

Matthew Wallin, P.E. – Chair

Partner & Senior Project Manager, Bennett Trenchless Engineers

Greg Tippett, P.Eng. – Vice-Chair

Regional Delivery Lead, Western Canada Water Group, Stantec Consulting Ltd.

Dan Buonadonna, P.E. – Treasurer

Global Technology Leader, Jacobs’s Condition Assessment and Rehabilitation Services (CARS) Practice

Babs Marquis, CCM – Secretary

Trenchless Practice Lead – East Coast, Delve Underground

Tiffanie Mendez – Officer-at-Large

National Director of Sales for Sunbelt Rentals, Pump Solutions

Alan Goodman – Immediate Past Chair & International Representative

Market Development Manager, HammerHead Trenchless

Alan Ambler, P.E.

Owner, AM Trenchless

Lisa Arroyo, P.E.

Project Manager, Carollo Engineers

Maureen Carlin, Ph.D.

Trenchless & Tunneling Infrastructure Practice Leader, Garver

Andrew Costa

Vice President, Business Development, Insituform Technologies, LLC

Kim Hanson, P.E.

Project Manager and Tunnel Design Engineer, Hazen and Sawyer

Chris Knott

Lead Trenchless Estimator, BTrenchless

Andrea L. Long, PE, PMP

Principal Engineer, Capital Projects, City of Aurora, CO

Rick Melvin

National Product Specialist, TT Technologies, Inc. 

Stephanie Nix-Thomas, P.E.

President, Claude H. Nix Construction Co.

Charles Pullan, P.Eng.

Senior Project Engineer, City of Calgary’s Water Resources Department

Chris Sivesind

Territory Sales Manager, Akkerman

Andrew (Drew) Sparks

Director of Engineering, Engineering Group, Laney Directional Drilling

Jim Williams, P.E., PMP

Senior Associate, Brierley Associates

NASTT Regional Chapters

NASTT has a network of 12 regional chapters throughout the United States, Mexico and Canada. Regional chapters offer valuable educational and networking opportunities in your local area. Click on each chapter to learn more!

Share your ideas, network with colleagues and find solutions to your everyday challenges. With a single NASTT membership, you’re automatically enrolled, not only in the national organization but also in your regional chapter, if one is established.

NASTT’s Regional Chapter magazines are published annually or bi-annually by the chapter volunteers. Click here for more information and to view the most recent Regional Chapter magazines!

British Columbia

The British Columbia (NASTT-BC) Chapter was established in 2005 by members in the province of British Columbia, Canada.

Great Lakes, St. Lawrence & Atlantic

The Great Lakes, St. Lawrence & Atlantic (GLSLA) Chapter was established in 1995 and represents the Eastern Canadian perspective of the trenchless technology marketplace. GLSLA members are from Ontario, Quebec and the four Atlantic provinces.


The México Chapter was established in 2021 and represents the country of México’s perspective of the trenchless technology marketplace. MEXTT members are currently from and represent the entire country of México.

La Asociación en México se fundó en 2021 y representa la perspectiva del país en el mercado de las tecnologías de rehabilitación de tuberías sin excavación. Los miembros de la MEXTT actualmente son y representan a todo el país en México.


The Mid Atlantic (MASTT) Chapter was established in 2004 by members from the states of Delaware, Maryland, New Jersey, Pennsylvania, Virginia, West Virginia and the District of Columbia.


The Midwest (MSTT) Chapter was established in 1998 to promote trenchless technology education and development for public benefit in Illinois, Indiana, Iowa, Kentucky, Michigan, Minnesota, Missouri, Ohio and Wisconsin.


The Northeast Chapter was established in 2015 by members in the states of Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island and Vermont.


The Northwest Chapter was established in 1995 by members in the Canadian provinces of Alberta and British Columbia, Canada, and in Washington state. In 2005, the members in British Columbia established the NASTT-BC Chapter. In 2009, the members in Washington state established the Pacific Northwest Chapter and the Northwest Chapter adjusted the geographic area to include the members in the provinces of Manitoba and Saskatchewan, Canada.

Pacific Northwest

The Pacific Northwest Chapter was established in 2009 by members in the states of Alaska, Idaho, Oregon and Washington.

Rocky Mountain

The Rocky Mountain Chapter was established in 2009 by members in the states of Colorado, Kansas, Montana, Nebraska, North Dakota, South Dakota, Utah and Wyoming.

South Central

The South Central Chapter was established in 2015 to serve the members of NASTT from Oklahoma, Texas and the south central area of the United States


The Southeast (SESTT) Chapter was established in 2001 to serve the members of NASTT from Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee and Puerto Rico.


The Western (WESTT) Chapter was established in 2003 by members from the states of Arizona, California, New Mexico, Nevada, and Hawaii.


Matthew Izzard, Executive Director

Matthew has been involved in the trenchless technology industry since the late 1980’s, holding senior positions in sales and business development with equipment manufacturers. He has written and presented over 40 papers around the world and involved in the publication of accredited training courses and international standards. As Past Chairman of the United Kingdom Society of Trenchless Technology (UKSTT) and his activity as the Vice-Chairman of the International Society of Trenchless Technology (ISTT) he has a broad base of experience and knowledge. Based out of Seattle, he has been a member of the NASTT since 2017, including the Centre of Excellence for Pipe Bursting. He is also active in the Pacific Northwest Chapter.

Outside of work he enjoys spending time with his family, stamp collecting and travel. Previously a professional soccer match-official, he supports Tottenham Hotspur and loves visiting sports stadiums around the world!

Contact Matthew

Michelle Hill, Program Director

Michelle joined the NASTT staff in December of 2011. Previously she was the Conference Manager at Benjamin Media, Inc. where she managed NASTT’s No-Dig Show from 2007-2011 along with other trenchless educational events. She received her B.S. in Communications from Ohio University where she planned her very first special event — a comedy night with Jay Leno. Complementing her busy career, Michelle enjoys volunteering her time with Strongsville Early Childhood PTA, the Strongsville Food Bank, the Cleveland Sight Center, Cleveland Kids’ Book Bank, Ohio Pug Rescue and Make a Wish.


Contact Michelle

Jenna O. Hale, Marketing Manager

Jenna joined the NASTT staff in June of 2013. She has worked with trade shows, branding and marketing in the trenchless and construction industries for nearly 20 years. She received her B.A. in History from the California State University at Chico. Jenna volunteers at and/or supports various animal rescue, environmental and civic charities. She is a volunteer at Wind Wolves Preserve and tries to hike and attend volunteer days as often as possible. Jenna serves on the Board of Directors and is the Newsletter Editor for the Friends and Newcomers of Bakersfield. She is also an avid reader and an active member of her book club. In her down time Jenna can be found in the kitchen cooking up vegan treats for her family and friends, playing with her (many) cats, reading, planning her next Halloween costume or at the beach or a concert with her husband!

Contact Jenna

Carolyn Hook, Membership Outreach & Database Manager

Carolyn joined NASTT in December of 2018 bringing her extensive career in association management to the team and to NASTT members. Her expertise includes a breadth of member service-related projects, volunteer management, member and leadership development, community relations, student and young professional activities and association governance. With a B.A. in English/Writing Concentration, she enjoys writing activities including projects for the American Society of Association Executives (ASAE). She shares her skill set as a volunteer with ASAE, Matchbox Virtual Media, the North Jersey Home Schoolers Association and her church community. Residing in New Jersey with her husband, daughter and dog, she finds joy every day in her faith, family and friends.

Contact Carolyn

Jessie Clevenger, Business Development Manager

Jessie joined the NASTT staff in October of 2019 as the Regional Chapter Relations Manager and was promoted to Business Development Manager in November of 2022. Prior to joining NASTT, she was working as the Conference and Seminar Manager for Meeting Expectations for 3.5 years. Before joining the association management industry, Jessie was a wedding planner in Knoxville, TN after she graduated from the University of Tennessee (Go Vols!). Jessie calls Charlotte, NC home with her husband and two dogs, Mellie and Charles. When she’s not in her home office, you can find Jessie trying new restaurants in Charlotte, decorating her house prematurely for every upcoming holiday, or, most likely, eating her favorite food – soup!

Contact Jessie


Kari Webb, Education Manager

Prior to joining NASTT, Kari worked as the Financial and Education Coordinator for CDI College in Red Deer, Alberta. She received her B.A. in Education at the University of Wyoming. Maintaining a passion for education, she has also worked as a teacher for various organizations. In her free time, you can find Kari searching for the best coffee shop around or relaxing with her dog and cat at home.

Contact Kari


Victoria Cox, Regional Chapter and Events Coordinator

Victoria joined the NASTT Staff in April of 2023 as the Regional Chapter and Events Coordinator. Victoria has a B.A. in Communication Studies from Central Washington University and spent 7 years in the Real Estate industry prior to joining NASTT. Victoria is a skilled communicator with a personable demeanor. When she’s not busy helping our Regional Chapters or setting up event registration, Victoria loves to indulge her passion for travel and spending time with friends. She’s always on the lookout for new experiences and opportunities for personal growth. Her furry companion, Kai, provides much-needed breaks from her busy schedule for cuddles and playtime.

Contact Victoria


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