Our Team

Click on an employee photo to see their bio.

OWNERS

Terry McMahon, CPA

President/CEO, Shareholder
T.McMahon@McMahonpc.com

As the founding member of our Firm, Terry opened McMahon and Associates CPAs PC (formerly known as Terry McMahon and Co) in 1972.  Starting out with just a secretary, Terry has provided the direction and leadership necessary to reach our current level of 25 team members. A graduate of Indiana University, Terry has served as a Board or Committee member for several local organizations including Babe Ruth baseball, Munster Rotary, Center for Visual and Performing Arts; taught accounting at Calumet College and served 30 years as a Board of Director for a local bank. Terry is a member of the American Institute of Certified Public Accountants, Indiana CPA Society and Illinois CPA Society. Graduating from Hammond High School and Indiana University, Terry has been an avid sports participant in his youth and continues to be an avid sports spectator today. Proud father of 4 and grandfather of 6, Terry and wife, Karen enjoy traveling and time spent with family and friends.

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Terry McMahon, CPA

Terry McMahon, CPA

President/CEO, Shareholder

Karen McMahon, EA

Account Manager, Corporate Treasurer, Shareholder

After earning her Associates Degree in Accounting, Karen joined the McMahon and Associates team in 1984.  As an Enrolled Agent, Karen specializes in areas of personal and corporate tax.  Karen also provides account management and oversight for many of our family owned businesses as well as supporting the Firm with administrative supervision.   Karen is a member of the American Institute of Certified Public Accountants, Indiana CPA Society, National Association of Enrolled Agents and Notary of the Institute. When not at the office, Karen enjoys reading, traveling and spending time with her family. Born in Lowell Indiana and the mother of 1 son, Karen currently resides in Munster Indiana with her husband Terry.

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Karen McMahon, EA

Karen McMahon, EA

Account Manager, Corporate Treasurer, Shareholder

Jill Jones CPA, CVA

Accounting & Audit Department Chair, Vice President, Shareholder
J.Jones@McMahonpc.com

An honors graduate of Purdue University Calumet, Jill joined McMahon and Associates in 1993.  Her professional career has continued to develop. Earning her CPA in 1993, Jill became a shareholder of McMahon and Associates in 2005 and successfully completed the necessary requirements to become a Certified Valuation Analyst in 2013. Jill’s professional memberships include the American Institute of Certified Public Accountants, the Indiana CPA Society, the National Association of Certified Valuation Analysts.  She is a member of the Munster Chamber of Commerce, and sits on the Board of Directors of Legacy Foundation, the Munster Education Foundation and the Purdue University Calumet -   College of Liberal Arts and Sciences Advisory Board. When not handling accounting related issues, Jill enjoys spending time with her many nieces and nephews, supporting causes for Arts and education, cheering on the Chicago Bulls, the Symphony and shoe shopping!  Jill and her husband Darrel reside in Crown Point, Indiana.

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Jill Jones CPA, CVA

Jill Jones CPA, CVA

Accounting & Audit Department Chair, Vice President, Shareholder

Marisa Smoljan, CPA

Tax Department Chair, Corporate Secretary, Shareholder

A graduate of Indiana University, Marisa earned her CPA in 2010.  After spending several years with a larger CPA firm in Chicago, she joined the McMahon and Associates team in 2010 and took the managerial reins of the tax department in 2013. When not focusing on tax related issues, Marisa serves on the Finance Committee of United Way and enjoys spending time with her nieces and nephews. Marisa is a member of the American Institute of Certified Public Accountants, Indiana CPA Society and Illinois CPA Society. Marisa and her husband reside in Crown Point Indiana.

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Marisa Smoljan, CPA

Marisa Smoljan, CPA

Tax Department Chair, Corporate Secretary, Shareholder

EMPLOYEES

Amy Kreuger Leyendecker

Manager Payroll Processing Department

Amy attended Prairie State College and joined the McMahon & Associates team in 2011.  She quickly took control of the payroll department and fulfills the critical role of ensuring our client’s payroll needs are met.  Timely payroll processing is a necessity, and Amy’s calm demeanor is key in making that happen.  Payroll check processing and compliance with all tax deposit reporting is her specialty. When not at the office, Amy enjoys spending time with her family, including son Nathan.  A native of Matteson, Illinois, Amy currently resides with her husband and son in Highland.

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Amy Kreuger Leyendecker

Amy Kreuger Leyendecker

Manager Payroll Processing Department

Brandon Underwood

Accountant

Brandon joined the McMahon and Associates team in 2015 as a staff accountant after graduating from Purdue University Calumet. When he’s not in the office, Brandon enjoys spending time with his wife and two daughters.  He also likes reading, taking care of his dog, and watching sports.

Born in Crown Point, Brandon and his family currently reside in St. John.

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Brandon Underwood

Brandon Underwood

Accountant

Cortez Arnold

Accountant

Serving two years as an intern at McMahon andAssociates while completing his degree at Purdue University Calumet, Cortez joined the accounting team in 2015.  With a focus on the needs of our physician clients, Cortez also serves as a member of the audit team. When not working on his accounting career, Cortez enjoys spending time with his wife, Dominique and his twins, Coje’ & Cortez Jr., doing volunteer work, and watching & playing sports. A native of Hammond, Cortez has remained in the community.

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Cortez Arnold

Cortez Arnold

Accountant

Cyndi Solis

Audit Department Administrative Assistant

A graduate of Highland High School, Cyndi joined the McMahon and Associates team in 2004 as the administrative assistant to the accounting and auditing department.  In her role, she has the responsibility of assisting the audit team as well as providing bill pay services for our physician groups. When not working, Cyndi enjoys spending time traveling, watching Chicago sports teams, volunteering for the Cystic Fibrosis Foundation and relaxing with her family.  Married for 33 years, Cyndi and her husband reside in Highland Indiana.

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Cyndi Solis

Cyndi Solis

Audit Department Administrative Assistant

Daniel Hamstra, CPA

Audit Manager

Joining McMahon and Associates in 2005, Dan is a manager in our auditing department.   Dan is a graduate of Trinity Christian College with a Bachelor of Science Degree in Accounting and earned his CPA certificate in 2006.  Dan is a member of the American Institute of Certified Public Accountants and the Indiana CPA Society. Dan was raised with strong religious beliefs and continues to be active with his church. Proud father of 2, Dan enjoys playing outside with his sons. Dan currently resides with his wife and sons in St. John.

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Daniel Hamstra, CPA

Daniel Hamstra, CPA

Audit Manager

Debbie Burrell, EA

Tax Preparer
d.burrell@mcmahonpc.com
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Debbie Burrell, EA

Debbie Burrell, EA

Tax Preparer

Denise Meseberg, CPA

Accountant

Denise joined McMahon & Associates originally in 1997 and was a part of the Tax Department team for several years.  After taking time to raise three children she re-joined our Tax Department in 2015. Denise is a graduate of University of Illinois in Chicago with a Bachelor of Science in Accounting. When Denise is not working, she is very active with her children’s school activities and is currently the PTO Treasurer for the Elementary School where her youngest child attends. Growing up in Lansing, Illinois, Denise currently resides in Dyer with her husband and 3 children.

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Denise Meseberg, CPA

Denise Meseberg, CPA

Accountant

Donna Boss

Bookkeeper
d.boss@mcmahonpc.com

After attending Moraine Valley, she worked for an accountant in Orland Park for five years before joining the team of McMahon and Associates in 1997 as a member of our bookkeeping department.  Her role includes supporting the accounting team member with transaction processing and preparation of monthly bookkeeping for clients. Donna enjoys gardening, the beach, cheering for the Chicago Blackhawks and spending time with her children when not at the office.   The Humane Society is also a cause close and dear to her heart. Growing up on Orland Park Illinois, Donna currently resides in Lynwood Illinois with her husband and three children.

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Donna Boss

Donna Boss

Bookkeeper

Jackie Bobowski

Bookkeeper
j.bobowski@mcmahonpc.com

Jackie joined our team in 2009 when the firm she worked for was acquired by McMahon and Associates. With many years of office work on her resume, Jackie has become a valuable member of our team providing bookkeeping services to our clients. During her non-working hours, Jackie enjoys family time, watching IU basketball and volunteering her time with Unite and Fight for Cancer and Relay 4 life. A native of Hessville Indiana, Jackie and her husband reside in Griffith Indiana.

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Jackie Bobowski

Jackie Bobowski

Bookkeeper

Jennifer N. Buxton

Tax Department Administrative Assistant

Jennifer joined McMahon and Associates in 2016 as the administrative assistant to the tax department. Jennifer graduated from Indiana University Northwest with a Bachelor’s degree in Computer Information Systems. In her role, she has the responsibility of assembling and coordinating the e-filing of our tax forms and products. In her free time she enjoys spending time with her cat Riley, spending time with her family, and shopping.

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Jennifer N. Buxton

Jennifer N. Buxton

Tax Department Administrative Assistant

Joel Cooper, CPA

Staff Accountant, IT Manager
j.cooper@mcmahonpc.com

Joining McMahon and Associates in 2010, Joel is a member of our accounting and auditing department and manager of our technology department. Joel is a graduate of Denison University and Northwestern University and passed the CPA exam in 2011. Joel is a member of the American Institute of Certified Public Accountants, Indiana CPA Society, Illinois CPA Society and Notary of the Institute. While not working, Joel enjoys spending time outdoors, watching the Chicago Bulls and playing with his dog.  Joel resides in Munster Indiana.

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Joel Cooper, CPA

Joel Cooper, CPA

Staff Accountant, IT Manager

Jolanta Moore, CPA, CFE

Senior Accountant
j.moore@mcmahonpc.com

Born in Poland, Jolanta came to the US, attended Davenport University and earned her CPA certificate in 2005.  Joining McMahon & Associates in 2013, Jolanta provides valuable support to the accounting and auditing department and is a member of the American Institute of Certified Public Accountants and Indiana CPA Society.  Always on a path to further education, Jolanta’s first real job was teaching high school and has recently taught an accounting course at Purdue University Calumet. Her time away from the office is spent reading, thinking of internal controls and spending time with her family. Jolanta resides in Lowell Indiana with her husband and daughter.

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Jolanta Moore, CPA, CFE

Jolanta Moore, CPA, CFE

Senior Accountant

Kevin Richardson

Tax Department Assistant

Kevin joined the McMahon and Associates team in 2009 as the Tax Department Assistant.  Over the years, Kevin has transitioned from a full-time to a part-time role.  He joins us during our buys season to manage the processing of individual tax returns.  During his free time, Kevin enjoys spending time with his wife, volunteering at his daughter’s school, and restoring coin operated video games. Kevin was born and raised in Kokomo, IN and now he and his family live in Schererville.

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Kevin Richardson

Kevin Richardson

Tax Department Assistant

Krista McCollum

Payroll Processing Clerk
k.mccollum@mcmahonpc.com

Krista is a graduate of South Suburban College with an Associate Degree in Business.  Joining McMahon and Associates in 2014, Krista joined our payroll processing department assisting client with all their payroll and payroll tax related needs. Krista serves as a volunteer for the Cancer Society, is the mother of 2 and grandmother of 1, cheers for the Chicago Blackhawks and enjoys spending the weekends with her husband. A native of South Holland Illinois, Krista and her husband currently reside in Schererville Indiana.

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Krista McCollum

Krista McCollum

Payroll Processing Clerk

Kristina N. Black

Staff Accountant

Kristina is a graduate of Indiana University with a Bachelor’s Degree in Business and a Post Baccalaureate Certificate in Accounting. She is currently working on the CPA exam. With several years of experience, Kristina joined the team of McMahon and Associates in 2016 in our accounting department. In her free time, Kristina enjoys relaxing with her family and shopping for shoes.

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Kristina N. Black

Kristina N. Black

Staff Accountant

Margie Fornelli

Bookkeeper
m.fornelli@mcmahonpc.com

Margie joined our team in 2001 and serves as the internal bookkeeper for McMahon and Associates. Growing up in Hillside Illinois and attending Harper College, when not at the office, Margie enjoys helping adults with disabilities, cheering on the Bears and Cubs, enjoying the sunshine or running (having successfully completed a Half Marathon in San Francisco, and climbed the Willis Tower, 4 Presidential Towers, and the Hancock Buildings in Chicago for charity) and spending time with her family. Margie is the mother of two and the grandmother of 1 and currently resides in Crown Point Indiana.

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Margie Fornelli

Margie Fornelli

Bookkeeper

Matthew Stosich, CPA

Tax Manager
m.stosich@mcmahonpc.com

A graduate of Loyola University Chicago, Matt passed the CPA exam in 2011 and joined McMahon and Associates in 2013.  Matt is an integral part of our tax team specializing in corporate and partnership taxes.  Matt also provides account management oversight and enjoys membership in the American Institute of Certified Public Accountants and the Indiana CPA Society. Proud father of two, Matt enjoys spending time with his wife and sons, volunteering for his church and watching the Chicago Blackhawks. Matt and his family reside on southeast side of Chicago.

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Matthew Stosich, CPA

Matthew Stosich, CPA

Tax Manager

Olivia Gutierrez, EA

Staff Accountant
o.gutierrez@mcmahonpc.com

Joining the McMahon and Associates team in 2011, Olivia has been providing exceptional client services to a wide range of businesses.  Becoming an Enrolled Agent, Olivia has expanded her service offerings in the area of tax as she is permitted to represent clients when dealing with the Internal Revenue Service. Olivia is also pursuing her CPA certificate and attends Indiana University Northwest. When not thinking about tax related issues, Oliva enjoys spending time with her three sons as a sports spectator. A native of Hammond Indiana, Olivia currently resides in Schererville with her family.

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Olivia Gutierrez, EA

Olivia Gutierrez, EA

Staff Accountant

Penny Calhoun

Receptionist

Joining our team in 2015, Penny has accepted the responsibility to assist our clients during visits to the office as well as direct the incoming telephone calls.
Along with Penny’s previous employment opportunities, she offers more than 15 years of client relations experience and looks forward to meeting the wide variety of professionals visiting our corporate office. Penny is a member of the Notary of the Institute. Penny and her husband reside in Schererville.

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Penny Calhoun

Penny Calhoun

Receptionist

Phyllis Cope, EA

Staff Accountant
p.cope@mcmahonpc.com

With many years of advanced bookkeeping experience, Phyllis joined McMahon and Associates in 2010 as a staff accountant.  Earning her EA in 2011, Phyllis expanded her skills into the world of tax.  Currently Phyllis manages client accounts from start to finish while providing supervisory support to our team of bookkeepers. While not at the office, Phyllis enjoys antiquing, volunteering at her church and spending time with family. A native of Griffith Indiana, she and her husband have remained residents of that community.

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Phyllis Cope, EA

Phyllis Cope, EA

Staff Accountant

Sandy Mitidiero, EA

Tax Preparer
s.mitidiero@mcmahonpc.com

As an Enrolled Agent since 1996, with many years of experience, Sandy joined McMahon and Associates in 2011 as a member in our tax department.  Sandy specializes in personal, trust and estate taxes and provides valuable insight to complex tax issues. Inspired by her parents, Sandy enjoys spending her non-work hours with family (recently became a grandmother of twin boys), cheering on the White Sox and sneaking a piece of chocolate on occasion. Sandy attended South Suburban College and resides in New Lenox, Illinois with her husband Don.

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Sandy Mitidiero, EA

Sandy Mitidiero, EA

Tax Preparer

Trisha Zuklin

Admin Assistant
t.zuklin@mcmahonpc.com

Trisha joined the administrative team of McMahon and Associates in 1999.  Beginning as a typist and back up receptionist, Trisha has progressed to become an Administrative Assistant to the owners.  When not keeping track of the McMahon Team, Trisha enjoys spending time with her family, watching the Chicago Cubs, coordinating fund raisers for her daughter’s dance teams and bowling.  Trisha and her family reside in Highland.

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Trisha Zuklin

Trisha Zuklin

Admin Assistant