(262) 437-4545

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N91 W16480 Pershing Ave Suite #1
Menomonee Falls, WI 53051


Sandy Mullman, E.A.
Enrolled Agent / President / Accountant / Endorsed Local Provider for Dave Ramsey

Sandy Mullman - President Accountant EA of Management Unlimited

Sandy is a Cum Laude graduate of Ottawa University with a Bachelor's degree in Accounting and a minor in Economics. She spent 15 years working as an Accountant and Tax Accountant for the founders of Management Unlimited before branching off in 2003 and opening her own firm, A.B.S. Accounting & Tax Service, Inc. 

In 2010, Sandy bought Management Unlimited and merged the two firms together in the Menomonee Falls location. She has been helping small businesses and individuals for over 30 years! In this time, she has earned the credential of Enrolled Agent, which gives her unrestricted rights to represent taxpayers before the Internal Revenue Service, afforded only to EA's, CPA's and attorneys.  In 2017, she became an Endorsed Local Provider of Tax Services by nationally-syndicated radio host and personal finance guru, author Dave Ramsey.

Sandy has been married to Peter for 24 years and has two teen-aged children, a chocolate lab and a cat. Outside of work, she can be often be found at her kid's sporting events. She enjoys taxes, tax law, finance, travel, organic vegetable and herb gardening, and recharging herself by socializing with family and friends. 

Bonnie Snow, E.A.
Enrolled Agent / Accountant

Bonnie - Management Unlimited

Bonnie has been an integral member of Management Unlimited since 2010 as an Accountant and Tax Preparer. She is a QuickBooks Pro Advisor and an Enrolled Agent.

Bonnie is a graduate of Waukesha County Technical College with an Associates Degree in Accounting and became an Enrolled Agent this year. Over her 30+ year career, she has worn many hats… Small Business Owner, Office Manager, Accountant and Tax Preparer. 

In Bonnie’s free time she enjoys traveling, participating in many sports and spending time with her grandson, her family and her friends.  

Marty Seibert
Tax Consultant

Marty Seibert - Management Unlimited

Marty Seibert joined us in 2015 after working as a Tax Consultant for 25 years with Management Unlimited, Tax Management and H & R Block in Menomonee Falls. He also worked in public accounting and corporate tax departments after earning his degree in Accounting from UW-Milwaukee.

Marty lives in Brookfield with his wife of 50 years. They have 2 kids, 2 grandkids and a dog. They enjoy extensive world travel, camping and spending time with their family. 

Carollyn Schmidt
Executive Assistant

Carollyn Schmidt - President Accountant EA of Management Unlimited

Carollyn joined us in October of 2018, filling the roll of Executive Administrative Assistant.  In her spare time, you can find her hiking, camping or biking in the summer or downhill skiing in the winter.