Meet the Team

At McIlvain & Associates, our financial experts and CPAs have extensive backgrounds in the fields of taxes and accounting. We’re also proud, active members within the community. Our goal is to provide a warm, friendly, and comfortable environment that instills trust in each and every client. Click below to learn more about our dedicated staff.


Sandra McIlvain
CPA, Partner

Sandy founded the firm in 1988.  Her vision when opening her CPA firm was to provide high-quality professional CPA and accounting services, along with unparalleled customer service and responsiveness to her clients’ questions. Sandy enjoys working with her clients and her staff to solve accounting issues and to save tax dollars.

In addition, Sandy wanted to provide a home-like atmosphere for her offices, so that her staff and clients would enjoy being there. Staying true to her vision, Sandy continues to enjoy the loyalty of her staff, many long-term client relationships, and an excellent reputation in the community.  Sandy has now mentored and promoted Kelli Strube and Tasha Whiddon from within her staff to become partners in the firm.

Sandy received a BBA in Accounting from University of Texas at Arlington. In her spare time, she enjoys photography, worldwide travel, sailing on Lake Grapevine with her husband Ted, and spending time with their two sons and six grandchildren.

Find Sandy on LinkedIn.

Kelli Strube
CPA, Partner

Kelli joined the firm in 2002. With over 30 years of experience in the field of accounting, Kelli’s work background includes both private industry and international public accounting, estates, trusts and new business formations. Now as a partner in the firm, Kelli focuses on open communications with clients and continuing professional education to stay informed of tax regulations. She is passionate about helping clients strategically plan long-term goals for tax management and business success.

Kelli earned a BS in Accounting from Texas State University and has been a CPA since 1985.  Kelli is a member of the Texas Society of Public Accountants and the American Institute of Certified Public Accountants.

Kelli serves as Treasurer on the Board of Directors of Trinity Habitat for Humanity.  Kelli has also volunteered her time in many of their building projects.  In her spare time, Kelli enjoys gardening, bike riding and traveling to ocean-side, stress-relief getaways.  She and her husband Gary have two grown children.

Find Kelli on LinkedIn.

Tasha Whiddon
CPA, MBA, Partner

Tasha joined the firm in May 2008 as a CPA, and in January 2014 she was promoted to Partner.  Since joining the firm, Tasha has earned vast experience in many different areas of business and personal tax, tax planning, compilation reporting, and payroll reporting. Prior to 2008, Tasha’s work experience included manufacturing and real estate accounting in corporate settings as well as public accounting.

Tasha understands that each client has a separate set of unique needs, and she is dedicated to educating her clients in the complex environment of new tax laws and compliance reporting. Tasha enjoys working with multi-entity business owners of dentistry and veterinary practices, and she has many long-standing client relationships within these fields.

Tasha earned her BS in Accounting from Wichita State University and earned her MBA from Missouri State University (formally known as Southwest Missouri State University).  Tasha has been a member of the Texas Society of Certified Public Accountants since May 2008. In her spare time, she enjoys reading, traveling and spending quality time with her family.

Find Tasha on LinkedIn.

Accounting Professionals

Norma Beltran
Senior Accounting Professional

Norma joined the firm in 2013 and is a CPA candidate. Her work experience includes public accounting, cost accounting and mortgage lending. She enjoys the complexity and challenges of the ever-changing tax laws, as well as working with diverse types of business clients, from single member LLCs to S-Corps, C-Corps and Partnerships.

Norma enjoys working with clients on all their accounting needs, including the process of incorporating, payroll, and the review of their books for compliance. She takes pride in helping her clients craft strategic and comprehensive tax and accounting strategies.

Norma graduated from the University of Texas at Arlington with a BBA in Accounting. She is bilingual with fluency in Spanish.  In her spare time, Norma enjoys photography and dance.  She lives in Arlington and has two sons, one of whom attends Texas A&M University.

Find Norma on LinkedIn.

Maryanne Nielson

Maryanne joined the firm in 2005 and has corporate accounting experience as a financial analyst. She earned a BBA in Accounting from the University of Texas and an MBA in Finance from the University of Dallas.

Maryanne is a member of Good Shepherd Catholic Community where she participates in the nursing home ministry and other volunteer opportunities. She is also active in the National Charity League and the CHHS Pantera Booster Club.

When she has free time, Maryanne enjoys running and reading. Maryanne and her husband, Jeff, have three daughters.

Kimberly Anderson
Accounting Professional

Kimberly joined the firm in 2009.  She graduated from the University of Texas at Austin with a BBA in Accounting. She and her husband, Toby, own a construction company, and she has both real estate and cost accounting experience. Kimberly enjoys the long-term relationships she has built with her clients and takes pride in being a trusted partner for their tax and accounting needs.

Kimberly is a member of 121 Community Church, volunteering in various outreach programs sponsored by the church, and she also participates in volunteer opportunities through Colleyville Heritage High School.

She and Toby enjoy spending free time with their three active children, and splitting time between visiting College Station and boating on Lake Tawakani.

Jasmine Armstead
Accounting Professional

Jasmine joined the firm in the fall of 2016. She graduated from the University of Texas @ Arlington with a BS in Accounting and also has working experience in corporate accounting. She is an avid learner and is excited to gain new knowledge on tax and accounting. Jasmine looks forward to building relationships with our clients and working to provide exemplary customer service in the process.

In her spare time, Jasmine likes to cook, shop, and travel.

Kathy Clifton
Accounting Professional

Kathy joined the firm in February 2006. She has extensive accounting experience in many business settings and earned her BS in Accounting from Arizona State University. Kathy enjoys long-standing relationships with her clients and is always willing to take on a much larger role during our peak tax season.

Kathy and her husband have three grown children and enjoy spending time with them and traveling to their ranch near the Texas-Oklahoma border. Kathy is also an avid tennis player.


Marketing and Administration

Janine Castleberry
Marketing/Business Development Manager

Janine joined the firm in June 2005 as Office Manager. In 2010, she transitioned to her current role as Marketing and Business Development Manager.  She enjoys being the face of the firm in our community and involvement in the Southlake Chamber, Southlake Executive Forum, Colleyville Chamber, and Grapevine Chambers and the Southlake Women’s Club keep her quite busy.  Janine is a “connecter” who is always looking to make introductions that can reap mutual benefits.

Janine has four adult children and two grandchildren. She enjoys gardening, hiking and planning trips with family and friends. Janine also enjoys coaching others in their better health, as an active AdvoCare distributor for almost two decades.

Find Janine on LinkedIn.

Stephanie Mays
Office Manager

Stephanie joined the firm in September of 2011.  She enjoys the variety of work and client interaction that managing our busy office provides. She earned a BA in Liberal Arts from Ambassador College in Pasadena, California, and is a member of the DFW Metroport Chapter of National Charity League. She likes to take long walks and to read long books. Stephanie enjoys movies, music, spending time with friends and with her two children.


Pam McClintock
Administrative Assistant

Pam joined the firm in September 2007.  She provides critical administrative support to our office and is responsible for organizing and maintaining document retention for the firm. Pam takes great pride in creating processes that enable the staff and our clients to have highly secure and also user-friendly access to their important financial documents.

Pam and Laura Robison have instituted a health and wellness program at our firm, publishing a health and wellness newsletter, recognizing healthy habits within the staff, and offering regular yoga classes at the office.

Pam graduated from Texas A&M University with a BBA in Business Management. Pam and her husband, Tim, have two daughters, one currently a student at A&M and the other, a recent graduate.  Pam is a member of Gateway Church, and she enjoys traveling and spending time with family and friends.

Carolyn Mills
Payroll and Administrative Professional

Carolyn joined the firm in 1998 and served as Office Manager when the office staff consisted of just herself and Sandy McIlvain, the firm’s founder. Carolyn was instrumental in the early years, creating processes and administrative support as the firm enjoyed continued growth.  In 2005, Carolyn transitioned to a part-time role with the firm so she and her husband could have flexibility to enjoy their passion for travel around the globe and to spend time with their two adult children.

Carolyn remains an important member of our team, preparing payroll reports and Form 1099’s and W-2’s on a quarterly basis. She also provides administrative support during our peak tax season.

Johnnie Miller
Front Office Administrator

Johnnie joined the firm in January 2017 and may well be your first point of contact when visiting or calling our firm. She loves meeting new people and believes every day is a gift and a chance for a new adventure. Born near Houston, Johnnie is excited to reside in her home state again, as she and her family recently relocated from the Oklahoma City area.

Johnnie earned her degree from Rose State College, Midwest City, OK, and has worked in various administrative roles over the years. Her husband, Demry, and she have two adult children and are actively involved at Friendship Church in Denton. She loves spending time with family and friends, watching movies and taking vacations to the beach.