Meet our Team
Keith Mandel, P.E.
President
Keith Mandel, P.E.
President
Keith Mandel serves as President of OMI and contributes over 37 years of experience providing professional engineering and consulting services towards the OMI team. Mr. Mandel received a Bachelor of Science from The University of Florida in Civil Engineering and began his career as a Geotechnical Engineer in Deer Beach, Florida. Subsequently, he moved to Huntsville, Alabama, and in 1995, he co-founded OMI, Inc. Mr. Mandel is one of the most sought-after experts in the fields of Geotechnical Engineering, Environmental Consulting, Construction Materials, and materials laboratory testing and has provided these services in multiple states throughout the United States. Mr. Mandel has successfully served as Principal Engineer on diverse portfolios of projects for both the private sector, as well as local, state, and federal government projects. Mr. Mandel is an expert in site feasibility and selection evaluations, geologic studies, subsurface exploration, foundation design, pavement studies, earth and dam designs, landslide, landfill, groundwater studies, laboratory analysis, site preparation, and construction monitoring and observation. Mr. Mandel also has a proven history in performing and in senior oversight of environmental projects, such as ASTM Phase I and II Environmental Site Assessments, soil and groundwater remediation and monitoring, NEPA evaluations, Waters of the US Consulting, and local Subdivision Site Assessments. Keith enjoys fishing off the Florida Coast. and spending time with his six grandchildren.
Stacy Hershey
Controller/HR Manager
Stacy Hershey
Controller/HR Manager
Stacy grew up in Glendive, Montana, before studying for an undergraduate in accounting at Jeff State Community College. Since then, Stacy has accrued more than three decades of small business & corporate taxes accounting experience. Two decades of which were at a CPA firm as a supervising Sr. Staff Accountant with the remaining being spent in the private sector. Since arriving at OMI, Inc., Stacy has utilized her extensive experience to improve processes company-wide, opening up new and exciting opportunities for our business and our employees. In her free time, Stacy is a wife, mother and grandmother who enjoys riding across North America on her Harley Davidson with the oldest all-female riding club.
Tyler White, P.E
Geotechnical Engineering Manager
Tyler White, P.E
Geotechnical Engineering Manager
Tyler White serves as the Geotechnical Engineering Manager at OMI. Tyler received his Bachelor of Science in Civil Engineering from Auburn University. He began his career with OMI, Inc. in 2013 as a soil and concrete technician and advanced into the Geotechnical Engineering Department in 2015 where he worked as a Staff Engineer for five more years. Tyler moved to Panama City Beach, Florida in 2020 where he continued his professional experience as a Project Professional for NOVA, a Project Engineer for the United States Army Corps of Engineers, and a Construction Manager for the Naval Facilities Engineering Systems Command. Tyler returned to OMI in March, 2026 to serve as the Geotechnical Engineering Manager. He has a broad skillset in the field of Geotechnical Engineering including geotechnical site investigations using traditional methods as well as 1D, 2D, and 3D electrical resistivity imaging methods. Tyler has successfully performed foundation design studies, slope stability analyses, landslide studies, retaining wall design, initial and rehabilitative design of earth dams, pavement design and evaluation, and seismic site class determinations. Tyler’s construction QC and QA experience includes field and laboratory testing of soil, concrete, and asphalt. He has successfully performed reinforcement steel inspections for coastal high-rises, slab post-tensioning inspections, vibrating wire piezometer monitoring, inclinometer monitoring, design and monitoring of sinkhole repairs, and has monitored construction of auger-cast piles, driven piles, and rammed aggregate pier foundations. Notable projects include a full-time construction quality control for a 42-ft high mechanically-stabilized retaining wall in aeolian soil, management and contract administration for a $73M MILCON-funded Air Force facility, and a geotechnical engineering study for the new Huntsville City Hall. Tyler is an avid outdoorsman and in his spare time he enjoys kayak fishing, marksmanship, and wild turkey hunting across the southeast.
James Sharp
Constructions Services Manager
James Sharp
Constructions Services Manager
James Sharp is the Construction Services Manager at OMI, Inc. in Huntsville, Alabama, where he leads engineering and construction services projects with a focus on quality, efficiency, and compliance. In this role, he prepares and analyzes scopes of work, develops cost estimates, and reviews project plans and specifications to produce detailed, accurate proposals. James works closely with clients, contractors, architects, and owners to ensure smooth project progression and clear communication at every stage.
He oversees scheduling and coordination of field technicians performing soil, concrete, asphalt, and other materials testing, and conducts key field activities including proof-rolls and footing observations. James also monitors construction activities to ensure safety, environmental compliance, and adherence to budget and schedule requirements—providing proactive recommendations to keep projects on track.
James holds an extensive range of industry certifications, including:
• ACI Concrete Field-Testing Technician – Grade 1 • ACI Concrete Strength Testing Technician • ACI Aggregate Testing Technician – Level 1 • ACI Aggregate Base Testing Technician • ACI Concrete Laboratory Testing Technician – Level 1 • Radiation Safety Technician • OSHA 10 • QCI for Construction Stormwater • ALDOT Concrete Technician • NCAT Roadway Technician
These credentials reflect his strong technical foundation and commitment to high standards in materials testing, construction oversight, and project management.
James holds an extensive range of industry certifications, including:
• ACI Concrete Field-Testing Technician – Grade 1 • ACI Concrete Strength Testing Technician • ACI Aggregate Testing Technician – Level 1 • ACI Aggregate Base Testing Technician • ACI Concrete Laboratory Testing Technician – Level 1 • Radiation Safety Technician • OSHA 10 • QCI for Construction Stormwater • ALDOT Concrete Technician • NCAT Roadway Technician
These credentials reflect his strong technical foundation and commitment to high standards in materials testing, construction oversight, and project management.
John Abrehamsen
Environmental Services Manager
John Abrehamsen
Environmental Services Manager
John Abrehamsen serves as the Environmental Services Manager at OMI. He began his career in 2015 as a military policeman in the United States Navy, where he managed armory operations across multiple installations. After his military service, John earned a Bachelor of Science in Forest Resources and Conservation from the University of Florida. He launched his environmental career with a civil engineering firm in Tampa, Florida, supporting utility and development projects statewide. His experience includes wetland delineations, tree inventories, listed species surveys and relocations, bald eagle monitoring, water quality sampling, and environmental compliance and remediation. John later served as the Petroleum, Oil, and Lubricants (POL) Environmental Program Manager at MacDill Air Force Base, where he ensured regulatory compliance for aboveground and underground storage tanks. He also led the development and implementation of the installation’s Spill Prevention, Control, and Countermeasure (SPCC) plan and contributed significantly to its Natural Resources Management Plan. Outside of work, John enjoys hiking and camping throughout Alabama and Tennessee with his wife and dogs.
Alura Garrison
Environmental Scientist
Alura Garrison
Environmental Scientist
Alura Garrison supports OMI’s environmental division as an environmental scientist. She attended the University of Alaska, Fairbanks in 2007, and later transferred to Auburn University. Alura graduated at Auburn University with a Bachelor of Science, concentrating in Marine Biology and began her career in the sciences in 2013 at Eurofins Scientific, formerly known as Eurofins | MWG | Operon, as a customer service technician. After leaving Eurofins due to the company relocating in 2015, she explored other fields of interest including animal welfare and veterinary support with the City of Huntsville. In 2018, Alura began her environmental career in Huntsville, Alabama, as an Environmental Specialist supporting NASA’s Marshall Space Flight Center (MSFC) on the Redstone Arsenal. There, she learned invaluable experience as the sole preparer for the facility’s annual Emergency Planning and Community Right-to-Know Act (EPCRA) reports, regulated by both the EPA and Alabama’s Department of Environmental Management (ADEM). Alura’s other responsibilities at MSFC included managing the facility’s hazardous materials tracking system and customer interface platforms, and presenting quarterly required training for the MSFC public. After over seven years of loyalty to this role, Alura took on a new challenge and joined the OMI family in the fall of 2025. Alura currently works on environmental projects including Phase I Environmental Site Assessments (ESAs), stream assessments, and groundwater and stormwater sampling and monitoring. She has applicable accreditations including the 40-hour Hazardous Waste Operations and Emergency Response (HAZWOPER) certification, Qualified Credentialed Inspector (QCI) certification, and National Pollutant Discharge Elimination System (NPDES) training.
Alura enjoys reading, all things flora and fauna, and is a strong supporter and advocate for humanitarian services, and sustainability and conservation biodiversity. Alura and her family regularly open their home through the state foster program, and when time allows, enjoys new experiences, including foods and cultures, and exploring the great outdoors all around the world.
Alura enjoys reading, all things flora and fauna, and is a strong supporter and advocate for humanitarian services, and sustainability and conservation biodiversity. Alura and her family regularly open their home through the state foster program, and when time allows, enjoys new experiences, including foods and cultures, and exploring the great outdoors all around the world.
Isaac Douglas
Environmental Scientist
Isaac Douglas
Environmental Scientist
Isaac Douglas supports OMI’s environmental division as an environmental scientist. In 2008, Mr. Douglas graduated from the University of Alabama with a Bachelor of Arts degree in Anthropology with a concentration in Archaeology. His admiration for Indiana Jones movies is what gave him the motivating drive to become a archaeologist. From 2003-2010, Isaac has worked on many projects in Alabama and Mississippi. In 2004, he started Field Archaeology class in Moundville, Alabama, 2004. This class was the start of his passion to survey and excavate the geographical lands inhabited by early Native Americans. In 2007, he embarked on taking a cemeteries course, in which he performed Cultural analysis of over 30 cemetery sites in Tuscaloosa County. Isaac has worked as a field archaeologist in Phase I, II, and III projects, surveying multiple sites in Hattiesburg, Lucedale, and Biloxi, MS. I also conducted surveys in the communities of Vaughn and Canton, Mississippi. Isaac is experienced in excavating specific geographical areas in sometimes difficult conditions and in classifying data and artifacts from the field. From 2022 to the present, Isaac is certified and has assisted with and conducted wetland delineations, in which he is qualified in identifying hydric soils, hydrophytic vegetation, and wetland hydrology indicators that comply with the USACE Wetland Delineation and regional supplements. For three years, Mr. Douglas has experience in classifying soil samples in various field environments and performing Atterberg limits testing, determining the plastic limits, liquid limits, and plasticity index. Isaac has training also in Phase I Site Assessments, soil and groundwater testing. In his free time, he likes to work out, help to restore cemeteries, volunteer, and spend quality time with his family and friends.
Alicia Holt
NPDES Supervisor
Alicia Holt
NPDES Supervisor
Alicia was born and raised in Tuscumbia, AL but has lived in Huntsville for the past 35 years. She studied Civil Engineering at UAH while working with The Alabama Department of Transportation. Alicia works with OMI’s environmental division as NPDES supervisor and contributes to the wetland delineation projects. She is responsible for all CAD designs for each department, including retaining walls, foundations, boring locations, and environmental maps. She also works closely with contractors and the City of Huntsville on slope development plans.
In her spare time, Alicia enjoys gardening, cooking, golf, and hiking with her dog. Her favorite time is spent with her 3 children, and playing poker with her 90 year old dad.
