Kevin G. Biddle


Kevin Biddle is President of Mader Construction, having been with the company since 1995. Before becoming President in 2001, he held the positions of Estimator and Vice President of Purchasing. Today, Kevin is following in the footsteps of his father, James Sr., who served as Mader President for over 25 years.

Kevin is a past president of the Board of Directors of the Association of the Wall and Ceiling Industry as well past president of the Kidney Fdtn of WNY, Cystic Fibrosis Fdtn of WNY, American Subcontractors Association and Juvenile Diabetes Research Fdtn of WNY and Faith United Church of Christ.  Kevin is currently serving on the board of Dunkirk Camp and Conference Center.

Kevin graduated from Orchard Park High School in 1982 and attended Georgia Southern College. He resides in Orchard Park with his wife, Barbara, and they have two children, Kirsten and Jeffrey.

Jim Biddle, Jr.


Jim Biddle Jr., serves as Chairman and Secretary Treasurer of Mader Construction, overseeing all of the financial, insurance and bonding responsibilities. Jim’s been with the firm since 1986, previously holding the positions of Assistant Comptroller and Comptroller.

Jim currently serves on the St. Joseph Hospital Foundation board and has also served on the Board of Directors for the Leukemia Society of WNY. Jim graduated from Orchard Park High School in 1979 and LeMoyne College in 1983.

He resides in Orchard Park with his wife, Rosemary, and they have three children, Leah, Charlie and Timothy.

Hap Keller


Harold “Hap” Keller is Vice President/Superintendent of Mader Construction and is responsible for overseeing every job in the Erie, Niagara, Orleans and Genesee counties area. Hap has held the Superintendent’s position for over thirty years, after taking over for his father, Herm.

Before his role as Superintendent, Hap worked as a carpenter and carpenter foreman for Mader.

A graduate of East Aurora High School, Hap resides in Elma and has two daughters, Carrie and Katie.

Joe Knarr

Senior Estimator

Joe Knarr is the Vice President of Estimating for Mader Construction, overseeing a group of five estimators and project managers. His experience includes over 20 years of estimating for this company.

A graduate of Iroquois High School and Erie County Community College, Joe resides in Wales with his wife, Mary, and they have four children, Kyle, Tarynn, Tiffany, and Kevin.

Tom Beuler


Tom Beuler has been in construction since 1978. Tom started with Mader in 1985 and promoted to Foreman in 1991. In 2015, Tom started as a Superintendent. As Superintendent of Mader Construction, he is responsible for overseeing every job in the Southern Tier and Southern Erie County.

A graduate of Williamsville North, Tom is married to Carolyn and has four sons, Tom, Jim, Rick, and Marshall.