CNCA staff provides a wide range of experience and expertise and are connected to a large network of resources throughout the U.S. Whether your interests are related to policies and regulations, materials, specific applications or projects, we encourage you to contact us. CNCA staff is dedicated to providing responses to your inquiries, meeting with you and providing presentations and workshops.

Tom Tietz - CementThomas R. Tietz

Executive Director

Phone: (714) 694-0800
click here to email Tom

Tom Tietz is the Executive Director of the California Nevada Cement Association. In this role, Tom is involved with and oversees CNCA’s regulatory and legislative efforts that focus on infrastructure and the environment. He also is actively engaged in the association’s mission to advance the use of cement and concrete throughout the region.

Tom’s career started in architecture. After receiving a Bachelor of Science and Master of Arts degrees in Architecture from the University of Illinois and practicing as a licensed architect, Tom has been working for trade associations since the mid 90’s. These associations include CNCA and the Concrete Reinforcing Steel Institute. He has provided seminar topics to agencies, architects, engineers, contractors and universities across the United States.

When not at work, chances are you will find Tom spending time with his family, preferably outdoors. This is one reason why he loves living in Southern California.

Jeffrey Wykoff, P.E.

Manager – Engineered Cement Applications
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Jeff Wykoff joined the California Nevada Cement Association as Engineered Applications Manager.  He provides technical expertise, education, industry resources, and budget cost assistance to infrastructure owners, engineers, and developers to take advantage of the versatility of cement. Jeff’s experience with the uses and construction procedures for Engineered Applications are diverse. His efforts extend to dams, levees, wwt, pavements, ports, embankments, and other infrastructure. Jeff is active in local societies including ASCE, SEAOC, and CalGeo.

 Prior to joining CNCA, Jeff performed geotechnical, structural, and civil engineering work for consultants and owners. Jeff also worked for a geotechnical specialty contractor performing Cement Deep Soil Mixing. Project experience includes the winner of the ASCE Region 9 Geotechnical Engineering Project of the Year award for the San Pablo Dam seismic upgrade. He received his bachelor’s degree in Civil Engineering With Distinction at the University of Minnesota. Jeff is licensed as a Civil Engineer in the state of California and is also licensed as a Civil, Structural, or Professional Engineer in 4 other states.

Clay Slocum, P.E.

Pavements Engineer
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Clay Slocum joined CNCA as the Northern California/Northern Nevada pavements engineer in January 2014.  Clay is based in Chico, California.  He provides technical expertise, education, concrete resources, and several other services to municipalities, engineers, and developers to advance the applications and use of concrete for streets, local roads, and parking areas.

Clay specializes in conventional concrete, concrete overlays, roller compacted concrete, and pervious concrete, but is knowledgeable on most concrete-related applications.  Clay is active in local societies including ASCE, ACI, SNCA, CalGeo, and EBME (where he is the outgoing co-chair).   Prior to joining CNCA, Clay worked as a geotechnical consulting engineer in Walnut Creek, California.  He graduated from University of the Pacific with bachelor’s degree in Civil Engineering and a minor in Engineering Management before continuing his education at U.C. Berkeley where he obtained his Master’s degree in Civil Engineering.  Clay is a licensed civil engineer in the state of California and is certified by ACI.

For fun, Clay enjoys spending time with his new family, dancing, playing sports, and working on antique tractors. Clay is a former dance instructor and competes at several west coast swing dance conventions. In September 2013 Clay welcomed his first daughter into the world.

Nathan W. Forrest, P.E.

Pavements Engineer
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Nathan Forrest joined the CNCA as the Southern California and Southern Nevada Pavements Engineer in the Fall of 2015. Nathan’s function is to provide resources, recommendations, education, technical expertise and other services to municipalities, engineers, project owners, developers and contractors. His project focus ranges from highways, streets & local roads, multi-modal facilities and parking areas.

Prior to his work with the CNCA, Nathan worked as a consulting materials engineer on numerous large Caltrans projects in Southern California, most recently on the Gerald Desmond Bridge replacement in Long Beach. He graduated from with bachelor’s degree in Civil Engineering from the University of Arizona in Tucson, AZ. Nathan is a licensed civil engineer in the state of California and maintains certifications by ACI and PCI.

Outside of work, Nathan enjoys spending time with his wife and daughter, playing golf, brewing beer, riding bicycles and motorcycles, and working out at a local CrossFit gym.

Tyler Bodnar , P.E.

Geotechnical Solutions Engineer
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In November 2017, Tyler Bodnar became the newest CNCA staff member joining us as the Geotechnical Solutions Engineer.  Based in Chico, CA, Tyler is working as part of the Engineered Cement Applications Program in the Northern California/Northern Nevada region.  He provides technical support for cement-based solutions including: Soil Cement Revetments and Linings, Cement Deep Soil Mixing, Jet Grouting, Lightweight Cellular Concrete, Pavement Recycling with Full Depth Reclamation, Treated Bases & Subgrades, Roller Compacted Concrete, and Solidification-Stabilization.

Prior to joining CNCA, Tyler worked for the City of Chico managing all facets of capital improvement projects from planning to design and construction.  His expertise and knowledge of the built environment make him a trusted resource for public agencies and private development organizations.  He graduated from California State University, Chico with a bachelor’s degree in Civil Engineering and is a licensed civil engineer in the state of California.

Tyler loves the pace of life in Northern California and enjoys all it has to offer with his wife and two young daughters.  On most weekends, he can be found hammering away on house projects or adventuring outdoors with his family.  He also enjoys travelling, catching fish, golfing, and sitting around a campfire.

Terri Zemlicka

Administrative Assistant
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Terri joined the CNCA as Administrative Assistant in August 2015. She earned her degree in English from Cal Poly Pomona. Prior to becoming a member of the CNCA staff, Terri worked for the western region of the Concrete Reinforcing Steel Institute where she handled administrative duties and organized their conferences and chapter meetings.

Terri has lived in Chino Hills, California for twenty years. She enjoys spending time with her husband and three kids and loves to be outdoors, especially in the High Sierras. Together with her family, Terri enjoys snow skiing, mountain biking, hiking, and hanging out by the pool with a good book.