We specialize in managing non-profit associations. Mattison was founded in 1988 and has experienced modest but steady growth over each of the past twenty four years.

We take pride in what we do.

Our hard work and desire to carry out the mission of the associations we serve, has resulted in sustainable growth for our clients, built on a foundation of trust and long lasting relationships.
Running on EOS® guides Mattison in achieving clients’ goals. Both member and stakeholder alike see this simple set of practical tools aiding Mattison in operating well so that we can focus on our impact.
Scott Grimes
Chris Price
Marissa Beck
Association  Coordinator
Aimee Conrad-Hill
Funds Development Director
Jessica Deak-Sims
Association Coordinator
Katelyn DeHaan
Executive Director
Sarah Eller, CAE
Association Executive
Sarah Everhart
Director of Finance & Operations
Kate Garrison
Executive Assistant
Jasmine Gettis
Financial Admin
Cameron Hicks
Association Administrator
Kyle Hickman
Association Manager
Vanessa Jimenez
Marketing Manager
Maria Johnson
Association Coordinator
Nicole Likens
Association Administrator
Jesse Linville
Lead Instructor
Gary Martin
Safety Director
Heather Martin
Program Director
Madison McGrath
Executive Assistant
Matthew Nance
Meaghan Owens
Lead Navigator
Brooke Paddack
Program Support Specialist
Daniel Perryman
Veronica Rand
Association Manager
Macoy Riley
Paige Riley
Association Manager
Jamie Sonnentag
Association Coordinator
Terra Summers
Membership & Events Coordinator
Kerry Tuttle
Director of Strategic Philanthropy
Kate Walters
Program Manager,
K12 Initiatives
Marcy Watson, CAE
Executive Director
Caroline White
Association Coordinator
Odessa Wieland
Marketing Coordinator
Macauley Wieland-Horning
Program Manager,
K12 Initiatives
Madalyn Williams
K12 Initiatives

25+ years

Founded in 1988, we continue to specialize in non-profits

100+ events

We plan and deliver over 100
events per year
We’ve been recognized as one of the Best Places to Work in Indiana. Learn more at BizVoiceMagazine.
Most of our efforts are put toward growing our clients. Our philosophy is if they grow, we will grow. We’re about leading and helping solve problems in industries and communities.
Scott Grimes