About Us

Kollath & Associates CPA is a professional services firm, providing accounting, tax, payroll, and human resources services to businesses, individuals, and nonprofits.


The company was launched in 2007 to provide tax and accounting services to individuals and small- to mid-sized companies. Since then, the company has grown to more than 30 employees with three distinct divisions: 


-Kollath CPA, the flagship division which offers a full range of tax and accounting services;

-Organic Payroll, which provides customized payroll services; and 

-SustainableHR PEO, which is a professional employer organization that manages and administers areas such as human resources, compliance to federal and state laws, and provides clients the ability to offer their employees benefits at a reasonable cost.


With offices in Madison, Sauk Prairie and Brookfield, our team is made up of experienced professionals across a wide array of business-focused services. As a result, we bring a wide set of business solutions to the table for each of our clients.


Madison Staff

Mike Kollath, CPA, Managing Partner
Mike Brand, CPA, Partner
Kelly Kutler, Business Development
Chris Roche, Client Accounting Services Manager

Erin Long, Payroll Manager

Chris Flessert, CEBS, SPHR, HR Service Manager

Linda Greene, PHR, SHRM-CP, HR Director

Emily Bartling, Senior Accountant
Jared Krueger, CPA, Tax Manager
Jill Bier, CPA, Insurance Consulting Manager
Kelly Woger, Senior Accountant
Kim Roberson, Accountant
Kristi Yeager, CPA, Senior Accountant
Marcus Schmitt, Accountant
Molly Berenson, Client Accounting Services Supervisor
Shelly Bartelt, Seasonal Tax Preparer
Ze Ching Oh, Accountant
Taylor Manning, Accountant
Payton Quirk, Accountant

Hannah Hansen, Accountant

Patricia Trebnick, Senior Accountant

Brookfield Staff

Kati Raiolo, Administrative Assistant

Lucas Petzold, J.D., CPA, MST, Tax Leader

Tim Kahle, CPA

Alex Tetzlaff, Accountant

Prairie Du Sac Staff

Julie Miller, CPA Partner
Jenny Pickhard, Senior Accountant
Katie Tiesing, Administrative Assistant