Since 1990

About McDonald Morrissey Associates

McDonald Morrissey Associates (MMA) was founded in 1990 by Michael "Mike" McDonald and Daniel "Dan" Morrissey.  Before co-founding MMA, Mike spent more than 20 years working as a hydrologist for the U.S. Geological Survey (USGS) at offices in Maryland, New Jersey, Michigan and at USGS headquarters in Reston, Virginia.  He served as the Groundwater Specialist for the northeastern region of the USGS, and he developed the groundwater model MODFLOW -  the most widely used groundwater model in the world.  Prior to founding MMA, Dan worked for the USGS in Utah, Maine and New England, where he served as Chief of the New Hampshire/Vermont District of the Water Resources Division of the U. S. Geological Survey.

MMA is nationally recognized for expertise in the analysis of complex groundwater flow systems for industrial and government clients. MMA principals share more than 100 years of experience in the conduct, management and technical oversight of a wide variety of groundwater projects.  MMA’s project experience includes: groundwater resource management and development; wellhead and source-water protection area delineation; mine dewatering; solute transport assessment; remedial design support; plume allocation; expert testimony and negotiation support; and regional groundwater flow assessment.

MMA staff are members of the National Ground Water Association, American Water Works Association, Geological Society of America, American Geophysical Union, and the International Association of Hydrologists.

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Office Address

280 Pleasant Street
Concord, New Hampshire 03301


(603) 228-2280

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