Zac Martin


As a third generation family member, Zac has been a part of the Stief Concrete team for 25 years.  He began by working in the field, where he built a solid foundation of first-hand experience in the industry. He then moved into the office and learned the specifics of estimating and project managing. He quickly became an essential part of the team and took on the role of head estimator/project manager, followed by General Manager, and eventually, President. When he is not in the office or out on a job site, Zac loves to spend time with his family and friends and listen to music. He also enjoys playing basketball.

Shawn Hollinger

Vice President of Site Work Division

For Shawn, Stief Concrete has always been an integral part of life. As a third generation co-owner, Shawn has grown up in the business. Following in both his father’s and grandfather’s footsteps, he began working at Stief Concrete at a young age. Today, he has over 30 years of experience in the concrete industry.  In addition to assisting with day to day operations and strategic planning, Shawn oversees the site work division of the company. When he’s not at work, Shawn may be found train watching, traveling or biking. He also enjoys trips to the beach, and most of all, spending time with his family.

Wesley Lewis

Vice President of Finance and Administration

Wes graduated from Temple University with a bachelor’s degree in business administration and comes to us with 25 years of tax, accounting, finance and business experience. Prior to joining our team, he worked as the secretary, treasurer and tax manager of Steinman Enterprises, then as vice president and tax manager of Fulton Bank’s wealth management division, and most recently, as a senior financial program lead for SHR Consulting Group.  Wes is also active in the community, serving as a board director and officer for the Shenk Foundation, a local non-profit serving Lancaster, PA and surrounding areas.

Wes loves all things outdoors and when he’s not working, he likes to go hiking, camping, ride four-wheeler, and explore. He also enjoys coaching youth sports and spending quality time with his family.

Mark Senft

General Manager

Mark has 25+ years of experience in the concrete industry, and is a concrete finisher by trade. He started working in the field as a laborer and worked his way up to a management position over time. Mark then utilized his extensive field knowledge and expertise to manage many multi-million dollar, large-scale projects for multiple general contractors over the years. At Stief Concrete, Mark oversees all daily operations, field personnel, safety and scheduling. He works closely with PMs and estimators on project scopes, budgets, schedules, etc., and ensures that projects are completed on time, under budget and safely. He also collaborates with ownership on company goals, future growth and employee growth.

In his spare time, Mark loves to play volleyball, golf with his wife and catch as many Penn State games as possible. He also enjoys being at his cabin and spending time with his family and two dogs. 

Charles Mull, Jr.

Construction Supervisor

Charles has been with Stief Concrete for a total of 35 years and holds the title of construction supervisor. His daily duties include managing the site work division, scheduling crews and material deliveries, and helping to train site workers as needed. He also works with customers to meet expectations and perform work in a timely manner, while insuring a quality product. In his spare time, Charles loves spending time with family and is involved in various church activities. He also enjoys the outdoors and is an avid homebrewer.

Damon Schlott

Project Manager

Since starting at Stief Concrete as a general laborer in 1984, Damon has climbed up through the ranks. From laborer he was promoted to carpenter, followed by foreman, and is now a full-time project manager. Damon works closely with both the estimators and the field workers to oversee and ensure the successful execution of projects. He manages projects in both the tilt-up and building construction divisions. In his spare time, Damon enjoys hiking, backpacking and shooting.

Derrek Keller

Estimator/ Procurement Manager

With 20+ years of experience in the construction industry, Derrek is an asset to the estimating team. He holds the title of Estimator/ Procurement Manager and his daily responsibilities at Stief Concrete include bidding potential jobs and submitting job proposals, as well as creating and maintaining successful business relationships with clients. In his spare time, Derrek enjoys spending time with his family and coaching his son’s baseball team. He also enjoys all outdoor activities, wood working and building custom fishing rods.

Jordan Way

Estimator/Project Manager

Jordan comes to us with 17+ years of construction experience. He’s done everything from restorative masonry to pouring and hand-finishing small concrete projects, to working on large commercial concrete projects.  Jordan started his career in commercial concrete as a field engineer and worked his way up to being a project manager. As a PM for Stief Concrete, he works jointly with general contractors, office and field personnel, to oversee and ensure the successful completion of projects. In his spare time, Jordan enjoys restoring old 70’s era motorcycles, welding/fabrication, hiking, biking, and camping.

Sherry Walter

Administrative Assistant

Sherry joined the Stief Concrete team in October of 2011. She is an integral part of managing the front office. Her day-to-day duties include processing payroll, accounts payable, accounts receivable and managing project data. Outside of work, Sherry enjoys antiquing, yard-saling, traveling, and riding motorcycle with her husband. She also loves spending time with her children and grandchildren.

Shannon Lewis

Communications/Recruitment Coordinator

Shannon graduated from the University of Delaware with a degree in Communications and has worked in various aspects of the communications field over the years. At Stief Concrete, she handles all print and online advertising, as well as online content management/design. She also assists in employee recruitment efforts by attending job fairs, contacting prospective employees and scheduling interviews. When she’s not working, Shannon enjoys spending time with her family and friends at the cabin, exploring new places, listening to music, going to concerts, and doing anything that inspires creativity.