Our Team


Daniel J. Morrissey, RPG

Co-Founder and Principal Emeritus

B.A., Biochemistry - Southern Connecticut State University

M.S., Hydrology - Univeristy of New Hampshire

Mr. Morrissey is co-founder and principal of McDonald Morrissey Associates, Inc. Mr. Morrissey has 35 years of hands-on experience in solving quantitative hydrogeology problems, and is a recognized expert in the application of ground-water flow and solute transport models.

While with MMA, Mr. Morrissey has worked hydrogeologic investigations in more than 20 states. As an example, his recent experience includes low-level radioactive waste site characterization in North Carolina, review of mining permits in Wisconsin, water supply studies in New England, and expert technical support for industrial clients at Superfund sites in several states.

Prior to founding McDonald Morrissey Associates, Inc., he served as Chief of the New Hampshire/Vermont District of the Water Resources Division of the U. S. Geological Survey. As District Chief, Mr. Morrissey supervised a staff of 30 hydrologists and technicians and was responsible for data collection, hydrogeologic investigations, and quality control for all work completed by the office. He has conducted training courses in basic hydrology, surface geophysics, and ground-water flow simulation for the USGS, for the National Ground Water Association, state and local water management districts, and private clients in the United States and Australia.


Charles P. Spalding, PG

Managing Partner

B.S., Geology - Virginia Tech

M.S., Hydrology - New Mexico Tech

Mr. Spalding has more than 28 years of experience in the conduct of quantitative hydrogeologic investigations. During these 28 years, Mr. Spalding has applied many numerical and analytical models for the characterization of ground-water flow and solute transport, and performed hydrogeologic investigation management.

Prior to joining MMA, Mr. Spalding worked for HSI-GeoTrans, Inc. and was project manager for numerous hydrogeologic investigation projects including groundwater flow and solute-transport modeling for ground-water resource, plume delineation, and remedial design, site characterization of hazardous waste sites, and water resource development.

Mr. Spalding was responsible for the administrative management of the Site Characterization Group in the Sterling, Virginia office of HSI-GeoTrans. He is experienced in a broad range of field tasks, including well drilling and installation, ground-water sampling, soil sampling, geophysical surveys, and aquifer tests.


Michael A. Mobile, Ph.D.

Managing Partner

B.S., Hydrology - University of New Hampshire

M.S., Environmental Engineering - Virginia Tech

Ph.D., Civil Engineering - Virginia Tech

Dr. Mobile has more than 15 years of experience in the areas of quantitative hydrogeology and hydrology, contaminant fate-and-transport assessment, and water resources management.

His professional experience has included model development in support of several large-scale, high-profile construction activities, natural resource management projects, and litigation/conflict resolution assignments. The sensitive nature of much of this work has allowed Dr. Mobile to explore a wide variety of innovative and interdisciplinary approaches to meeting client needs and addressing site-specific challenges.

Prior to joining MMA, Dr. Mobile worked for GZA GeoEnvironmental, Inc., where he acted as an in-house expert on Per- and Polyfluoroalkyl Substances (PFAS) and the evolving regulatory environment surrounding these compounds. Between 2014 and 2018, Dr. Mobile served as project manager of two New Hampshire site investigations primarily focused on PFAS while providing technical support to other PFAS-related projects, including sites in Michigan, Connecticut, and Massachusetts.


Daniel R. Walters

Hydrogeologist / GIS Analyst

B.A., English - Brandeis University

M.S., Hydrology - University of New Hampshire

Graduate Certificate, Geospatial Science - University of New Hampshire

Mr. Walters has been with MMA since 2015, during which time he has performed hydrologic and geospatial analyses to support a variety of groundwater modeling projects relating to resource management and groundwater contamination assessments. Specific areas of specialization include spatial and statistical investigations of hydrologic, geologic, and climate data, and digital elevation models.

To perform these analyses he uses an array of tools for processing data, such as Python scripting, database development, and GIS analysis.