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About us

McMahon & Mann Consulting Engineering and Geology

Since 1993, McMahon & Mann Consulting Engineering and Geology, P.C. (McMahon & Mann) has provided civil engineering consultation and design services for geotechnical, subsurface environmental and solid waste projects throughout New York and the eastern United States. The firm’s staff of eighteen includes nine professional engineers and one professional geologist. The firm maintains Certificates of Authority to provide engineering and geology services in New York State.

It is relatively rare to find such a sizable group of engineers in one firm concentrating on geotechnical assignments. As a result of their experience and their past performance, the people at McMahon & Mann have become recognized for their accomplishments in the field and are regularly retained by private industry, architects, engineers and contractors, as well as public agencies at various levels of government and property owners seeking advice.

Over 30 Years Of Experience In Engineering and Geology

Our philosophy

McMahon & Mann prides itself on its dynamic approach to problem solving, stressing the development of relationships with clients who share that philosophy. That means early involvement to define the scope of the project and develop a budget. The work phases that follow typically involve conceptual planning, design development, subsurface exploration, testing, analysis and design, construction and monitoring, with McMahon & Mann engineers, both in the office and at the job site, involved at each stage. This approach fosters development of a true design/construction team that lends continuity to the work on each project.

Get to know us

Meet our team

Mike Mann

Jim Janora

Susanne George

Susanne earned a Bachelor of Science in Civil Engineering from the University of Pittsburgh in 2006. She briefly worked at Clough, Harbour & Associates before attending graduate school. Susanne received a Masters in Engineering from Cornell University in 2008, specializing in geotechnical engineering. Upon graduation, she began her career at McMahon & Mann. Over the last 17 years, Susanne has worked on a variety of geotechnical projects. She finds excitement in projects that involve complex subsurface conditions. Her expertise includes the assessment of soft clays and applying specialized geotechnical methods to improve and stabilize the soil. In addition, Susanne served in leadership roles within the local section of the Society of Women Engineers for seven years. Outside of work, Susanne enjoys camping with her husband and three children, baking custom cakes, and listening to Taylor Swift.

Jon Whiting

Jon worked in the construction industry for over a decade before returning to school and completing his Bachelor of Science in Civil Engineering from the State University of New York at Buffalo in 2015, focused on geotechnical and structural engineering. He joined McMahon & Mann shortly after graduation and has taken a special interest in working on geostructural projects, including; retaining walls, support of excavation, coffer dams, and waterfront bulkheads. Jon enjoys working with his fellow engineers in the collaborative atmosphere fostered at McMahon & Mann to provide our clients with solutions to complex geotechnical problems. He spends his time outside of work enjoying the outdoors, going to concerts with his wife and three children, and coaching youth soccer.

Corey Hensen

Corey earned his Bachelor of Arts in Geological Sciences from the State University of New York College at Geneseo in 2017. During this time, he also worked in the construction industry. He then attended graduate school at Cornell University in 2018, earning his Ph.D. in Geological Sciences in 2025. His research focused on integrating subsurface geologic data and field studies to develop new models for the deposition of sedimentary rocks in the eastern U.S. Gulf Coastal Plain. While completing his graduate studies, he interned with the Mississippi Geological Survey, working on regional subsurface mapping and stratigraphic correlation projects. Corey is particularly interested in multidisciplinary geologic problems that incorporate regional geologic mapping, stratigraphy, and structural analysis. At McMahon & Mann, he has applied these skills to slope stability, landslide mitigation, and dam remediation projects. Outside of work, he enjoys hiking, camping, skiing, fishing, and woodworking. He is also an avid fossil collector and volunteers at the Penn Dixie Fossil Park and Nature Preserve in Hamburg, New York.

Darren Whittall

Before pursuing a career in engineering, Darren worked in the construction industry with his family’s construction company. Darren completed his Bachelor of Science in Construction Management from Alfred State and Bachelor of Science in Civil Engineering from the University at Buffalo. He joined McMahon & Mann in 2012 and has developed a specialty in working on solid waste engineering and construction projects. Outside of work, he enjoys exploring the outdoors and spending time with his wife and kids.

Shawn Logan

Ken Fishman

Dr. Fishman is a Principal at McMahon & Mann Consulting Engineering and Geology, P.C. and serves as the leader of the ERTesting Division. Dr. Fishman has spent the last twenty-five years implementing test techniques and developing a recommended practice and protocols for evaluation and condition assessment of earth reinforcements. This experience is an outgrowth of his participation on research projects supported by the National Cooperative Highway Research Program (NCHRP), which is a federal research agency affiliated with the National Academy of Sciences. As a Co-Principal Investigator for NCHRP Project 24-13 he assessed test methods and developed the testing protocols for condition assessment and evaluation of earth reinforcements. Further research as the Principal Investigator for NCHRP Project 24-28 was to evaluate sources of uncertainty with respect to observations and estimates of metal loss; and the reliability of service lives targeted in design. NCHRP Project 21-11 “Improved Test Methods and Practices for Characterizing Steel Corrosion Potential of Earthen Materials,” was completed in 2020 where Dr. Fishman, the Principal Investigator and co-workers evaluated different test techniques for measurement of electrochemical parameters for soils and aggregate type fill materials, and developed a protocol for sampling, testing and characterizing corrosivity of various types of earthen materials. As a result of this work, he is familiar with a number of techniques for corrosion monitoring and performance monitoring of earth reinforcements and is very familiar with the performance history of such systems as documented in the literature.

Mark Cronmiller

Josh Cardamone

Joshua completed his Bachelor of Science in Civil Engineering from the State University of New York at Buffalo in 2024, with a focus on geotechnical engineering. Josh was the vice president of the American Society of Civil Engineers student chapter during his senior year and was a member of the school’s steel bridge design team that placed second nationally. Joshua previously worked for the New York State department of transportation and interned for Turner construction where he gained an interest in geotechnical engineering. Josh would later interned at McMahon & Mann for six months before graduation and was then hired full time. Outside of work, Joshua enjoys competing in road races.

Andrew Nichols

Craig Smolkovich

Craig completed his Bachelor of Science Degree in Environmental Science from the University of New York at Buffalo in 1998, and also has an Engineering of Applied Science Degree in Civil Engineering Technology. Since joining McMahon & Mann in 2021, he has taken on the role of CAD Administrator / Engineering Draftsman. With his background in Environmental Science, Craig mainly focuses on Waste Management design projects. Outside of work he is a NYS Section VI Boys & Girls HS Volleyball Official, a musician, and enjoys golfing & recreational watercraft activities.

Nikole Williams

Todd Swackhamer

Todd completed his Bachelor of Science from the University of Cincinnati and Master of Science from the University of Michigan, both with a heavy focus in geotechnical engineering, and immediately joined McMahon & Mann in 1999. In the over 25 years since, his role has continued to evolve, finding many new geotechnical interests along the way. Todd finds particular interest in working on dams and embankments, geo-structural projects, retaining walls, and landslide remediation. Beginning in 2014, Todd and his fellow partners embarked on the ownership transition of McMahon & Mann from the founding partners, Mike Mann and Don McMahon, and has found the work both challenging and rewarding. Outside of work, he enjoys having adventures with his wife and kids.

Andy Klettke

Andy is a Senior Geotechnical Engineer with the firm having a Bachelor of Science in Civil Engineering from Clarkson University and Master of Science in Civil Engineering with a geotechnical engineering focus from Tufts University. He began his career with McMahon & Mann as an intern in 2006 and has stayed on with the firm since graduation, becoming a partner in 2017. He specializes in characterizing the ground conditions for earthen embankment dams, foundation design, slope stability, and excavation support system projects. A life-long Niagara County resident, Andy has recently served locally as ASCE Buffalo Section President, Holy Ghost School (Wheatfield) Board of Education Chairman, and a North Tonawanda Historic Preservation Commission Member. He is currently a part-time adjunct instructor in the Civil Engineering department at SUNY Buffalo.

Riley Sessanna

Riley attended SUNY Geneseo where he completed his Bachelor of Arts in Geological Sciences and then went on to Syracuse University to earn his Master of Science in Earth Sciences. During his time at Geneseo and Syracuse, Riley’s studies concentrated on earth processes and how they relate to deposition of soil, formation and deformation of rock, surface topography, and groundwater hydrogeology. He also became a licensed drone pilot and used this new skill to study earth processes from a new angle. Riley joined McMahon & Mann in 2019 where he uses these skills to understand and represent the subsurface conditions as it relates to solid waste engineering and construction, landslide remediation, transportation and utility infrastructure, and other geotechnical engineering projects. Outside of work, Riley enjoys camping with his family, working on outdoor projects, and barbequing on his homemade smoker.

Doug Lavelle

connor Irwin

Connor completed his Bachelor of Science in Civil Engineering from the State University of New York at Buffalo in 2023 with a focus on geotechnical engineering. He joined McMahon & Mann shortly after graduation and has an interest in working with subsurface exploration, foundation design, geostructural projects, and rock anchors. He spends his time outside of work traveling, enjoying the outdoors, and serving as a local ASCE board member.

Ann Maxwell

FAQ

We Are Here To Help You With Any Questions You May Have

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