M&A proudly employs skilled and experienced professionals.
Most of our principals have more than 20 years of real-world experience in the fields of hydrogeology, hydrology, geology, geochemistry, and/or soil sciences. Nearly all have master’s or doctoral degrees, along with one or more professional registrations. M&A staff frequently publish papers, present at conferences, and participate in technical groups and advisory boards.
Founder
Operations managers
Mark Cross, Tucson (President) | Dennis Hall, Phoenix | Mike Rosko, Santiago
Principals
The following employee principals provide localized technical and administrative control of the company:
Hale Barter | Janis Blainer-Fleming | Mark Cross | Jim Davis | Lyle Davis | Dennis Hall | Leslie Katz | Todd Keay | Jeff Meyer | Errol Montgomery | Mike Rosko | Ed Peacock | Mark Thomasson | Bill Victor | Greg Wallace
Staff scientists
M&A retains a highly qualified group of scientists who play key roles on projects in the field and the office.
Support staff
Our support staff includes a full-service scientific illustration department, along with various administrative professionals.


