The Numbers Guy

In 2015, with over 20 years experience of payroll, bookkeeping, and all other compliance services for my own businesses, I began offering my bookkeeping services to businesses in  my great hometown of Brentwood, CA.  Since then, I have steadily grown my practice to become a premier provider of bookkeeping services nationwide.  Leveraging my strong business background against my "always be learning" mindset has propelled me to be recognized in 2017 as a Thumbtack Top Pro.

At The Numbers Guy, we embrace the power of technology to help us produce a superior level of bookkeeping that fosters a very high level of trust between us and our clients.

Our Team
Greg Cullup, Founder

greg@thenumbersguy.biz | Phone: 925-719-1712

Aidan Walton, Special Projects


Greg has a Bachelor of Arts degree in Business Administration from California State University, Hayward (now CSU East Bay).  Out of college, he worked his way up through the ranks of a Bay Area courier company, eventually buying the business in 2001. and maintaining the role of CEO and CFO.  After deciding to move away from the courier industry, Greg chose to focus on a passion of his - numbers.  Realizing that most people don't share the same passion for numbers, Greg decided to become The Numbers Guy! So you don't have to be!

When Greg is not playing with numbers, you can find him on the softball field, at the poker table, or on a road trip with his amazing wife (who does not share his passion for numbers).

Aidan was brought on to our team in order to help with a very time consuming project, and boy, did he deliver!  He is now our go-to project specialist.

Aidan is a freshman at Heritage High School in Brentwood and is on both the track and cross country teams.  When he's not crunching numbers or running around the East Bay, Aidan can be found unwinding with an episode of The Office and a glass of chocolate milk.

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