About Team One Accounting

Do what you love, let us crunch the numbers for you


Team One Accounting is an established, full-charge bookkeeping and business support services company based in Costa Mesa, CA. We have over 25 years of experience helping our clients succeed. At Team One, we take care of time-consuming bookkeeping and resource-draining accounting responsibilities for you so you can focus on what you do best – growing your business! Our Team One team members can customize & optimize your QuickBooks® accounting software as needed to meet your unique requirements. We have a passion for helping businesses succeed and would love to become an integral part of YOUR team. Don’t delay, give us a call today to hear about all that we can do for you and your business. (949) 355-4521



We positively impact your bottom line, your peace of mind, and your passion for your small business by providing accurate and timely numbers and helpful responses to make you effective. We are the comprehensive advice and solution that you need to ensure your growth and financial security.

Patty Hansen

Company founder, President, Expert in all things QuickBooks®, Certified ProAdvsior in QuickBooks® & T-Sheets®

Patty has a passion for seeing businesses succeed and being part of their team. She loves to teach you what your numbers mean and how they can help you make the best businesses decisions. She is very adept at analyzing your business and financial numbers to educate you. She loves to train others on QuickBooks® and solve your problems using time saving apps and technology. QuickBooks® Online has been a game changer for businesses to be more efficient and profitable, she shows them how. Patty is a motivator and speaks frequently at various local network groups. She has a wonderful husband who is a fabulous cook. You can find her being a weekend warrior and loves to hike or swim on the weekends.

Team Member Kristen O'Connell

Kristen Lipsey

Bookkeeper, QuickBooks® Certified ProAdvisor®, Certified In all things T-Sheets®

Kristen prides herself on her knack for attention to detail, which motivates her to break down client’s books and help streamline their transactions into a comprehensive picture of their business. Kristen is a team player and enjoys helping her team problem solve potential issues.

Kristen graduated from California State University Fullerton with a degree in Criminal Justice in 2013. Kristen is an active reader who revels for the next crime podcast.

Kristen lives for her family. She is the proud mother of a baby girl born in 2020. Kristen is expecting another baby girl at the end of 2021.

Jael Burge

Bookkeeper, QuickBooks® Certified ProAdvisor®

Jael was born and raised in Southern California. She studied at Santa Ana College. Jael loves numbers, Excel and problem solving. She prides herself on learning why and how things work. She has a great deal of experience working with many different District Attorney’s offices and Merchants around the country.

She’s lived in both New Mexico and Texas but returned home to beloved California. She lives for her son and family and enjoys spending time with them. In her spare time you can find her bike riding, playing with her animals or gardening.

Team Member Sue Graham

Sue Graham

Bookkeeper, QuickBooks® Certified ProAdvisor®

Sue Graham enjoys working with numbers and solving the puzzles that occur when accounting transactions don’t match up or balance. She’s always been ‘that person’ who balances her checkbook to the penny numerous times each month. Her favorite subjects in school were statistics and math although her major at UCLA was in history.

Sue has bookkeeping experience in various industries: construction, restaurant (casual and fine dining), pet sitting, law firms, grocery store and is an active member or on the board of directors for multiple non-profit dog clubs. Her involvement in these industries isn’t limited to bookkeeping, but also customer service.

Sue’s weekends are filled with training, trialing, showing her own dogs or judging dog trials.

Kirby McIlveen

Bookkeeper, QuickBooks® Certified ProAdvisor®

Kirby graduated from California State University Fullerton with a Bachelor’s degree in Business in 2019. Her favorite classes in college were the accounting classes, where she could work in Excel and Quickbooks. She’s always loved tracking how money comes into a business and where it gets spent. Kirby is detail-oriented and prides herself on ensuring results are accurate.

When not working, Kirby spends most of her free time training, competing, and performing with her team of superstar dogs. Kirby and her dogs have traveled around the world, winning elite level competitions, including countless disc dog world championships and many Purina Incredible Dog Challenge events. They have performed halftime shows for NFL games including the LA Chargers and SF 49ers.

Olivia Maldonado

Bookkeeper, QuickBooks® Certified ProAdvisor®

Olivia graduated from Cal Poly Humboldt with a Bachelor’s degree in Psychology in 2021. Her passion for business and accounting came from her experience in banking. She focused on helping business owners understand and use products that would increase their work efficiency (i.e. payroll and bill payment).

In her free time, Olivia loves spending time with her family. She is a proud mother to her baby boy born in 2021. She also loves to garden.


Team ONE is an accredited QuickBooks® Certified ProAdvisor

Experience the TEAM ONE DIFFERENCE in your Company (949) 355-4521


Team One takes the hassle out of accounting so that you can focus on what you do best in your business and reach your dreams.


2973 Harbor Blvd # 127, Costa Mesa, CA