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
Aimee Kent, Senior Accountant
Kelly Kutler, Business Development
Chris Roche, Outsourced Accounting Manager
Chris Flessert, CEBS, SPHR, HR Consultant
Emily Bartling, Senior Accountant
Jared Krueger, CPA, Tax Manager
Jill Bier, CPA, Accountant
Kelly Woger, Senior Accountant
Kim Roberson, Accountant
Kristi Yeager, CPA, Senior Accountant
Marcus Schmitt, Accountant
Molly Berenson, Accounting Supervisor
Olivia Crescio, HR Consultant
Richa Shah, Accounting Generalist
Shelly Bartelt, Seasonal Tax Preparer
Ze Ching Oh, Accountant
Taylor Manning, Associate Accountant
Payton Quirk, Accountant

Brookfield Staff

Carol Van Duser, CPA, Tax Consultant
Jack Lundsten, Accountant 
Kati Raiolo, Administrative Assistant
Lucas Petzold, J.D., CPA, MST, Tax Leader

Praire Du Sac Staff

Julie Miller, CPA Partner
Allan Schmid, CPA, Supervisor
Jenny Pickhard, Senior Accountant
Julie Brickl, Accountant
Katie Tiesing, Administrative Assistant