Role listed
Rmw Accounting, Llc
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William Mattila, Cpa Email & Phone Number
Tax Director at Glenn B. Hetzel & Associates, CPAs, An Accountancy Corporation
at
RMW ACCOUNTING, LLC
1 work email found
@cox.net
LinkedIn matched
✓ Verified Jun 2026
4 data sources
Profile completeness 100%
Current company
Role
Tax Director at Glenn B. Hetzel & Associates, CPAs, An Accountancy Corporation
Location
Mission Viejo, California, United States
Who is William Mattila, Cpa? Overview
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Quick answer
William Mattila, Cpa is listed as Tax Director at Glenn B. Hetzel & Associates, CPAs, An Accountancy Corporation at RMW ACCOUNTING, LLC, based in Mission Viejo, California, United States. AeroLeads shows a work email signal at cox.net and a matched LinkedIn profile for William Mattila, Cpa.
William Mattila, Cpa previously worked as Tax Director at Glenn B. Hetzel & Associates, Cpas, An Accountancy Corporation and Senior Tax Manager at Karla Dennis & Associates. William Mattila, Cpa holds Bachelor Of Science, Accounting & Business Administration from California State University, Long Beach.
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Email format at RMW ACCOUNTING, LLC
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*@cox.net
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Profile bio
About William Mattila, Cpa
William Mattila has over 30 years experience in accounting and tax for both public accounting and private companies. William managed a CPA practice for 13 years and acheived average annual revenue growth of 10%. Implementing staff cross-training programs and regularly reviewing processes and procedures, he was able to reduce labor costs while at the same time increasing revenues.William has been the Controller/CFO of a start-up technology development company in Orange County. He developed and implemented cash management strategies to stay within the short and long-term goals of the company. He also developed and managed the accounting systems of the company and monitors the internal controls over the the assets and financial data.He worked as the Audit/Accounting Manager of a well-established CPA firm in Huntington Beach, California and now is the Audit Manager of a multi-office CPA firm in Irvine. He has performed and supervised certified audits for a wide variety of industries; such as non-profit organizations, manufacturing and transportation companies and has worked to develop procedures to consistently improve project efficiency. His responsibilities include planning, budgeting, staffing, and managing audit and accounting projects. He also trained and supervised the accounting staff and works with them to mentor and improve efficiency and quality controls. He has a real passion for assisting others. He is an active member of the Orange County community and regularly volunteers for several local non-profit organizations. He is a member of MultiSport Ministries - a triathlon team headquartered in South County, as well as a number of business networking organizations.Specialties: Personal, business, fiduciary and non-profit tax preparation and planning. Audit representation, negotiation and settlements. Certified Audits and Reviews. Fluent in Lacerte tax software, ProSystems fx software, BNA tax planning software and Quickbooks accounting software.
Listed skills include Accounting, Internal Controls, Auditing, Tax, and 30 others.
Current workplace
William Mattila, Cpa's current company
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9 roles
William Mattila, Cpa work experience
A career timeline built from the work history available for this profile.
Tax Director
CurrentResponsibilities include training and mentoring staff, preparing and reviewing all individual, corporate, partnership and trust returns and providing guidance to improve efficiency and productivity.
Aug 2020 - Present
Senior Tax Manager
Karla Dennis & Associates
Responsible for managing all aspects to the tax and accounting departments. These responsibilities include supervising and training staff, preparing and reviewing individual, business and trust tax returns and meeting all filing requirement and deadlines.
Nov 2016 - Aug 2020
Audit Manager
Responsiblities include budgeting, planning and staffing audit and accounting engagements. Management responsibilities to supervise staff, assist in training, and monitor projects. We work with many non-profit organizations, as well as for profit businesses. Redwitz, Inc. has three locations in California - Irvine, La Jolla and San Jose.
Aug 2013 - Aug 2016
Tax / Accounting Manager
Darrel Whitehead, Cpa'S
Responsible for budgeting, planning, staffing, and monitoring all accounting, audit, and business tax projects. Supervisory responsibilities for accounting and tax staff, as well as training and evaluations. Works to develop policies and procedures to solidify internal controls and enhance project efficiencies.
Feb 2011 - Aug 2013
Controller
Styqs, Inc
Overall authority for the financial operation of the organization, budget preparation and administration, taxation and accounting. Prepared forecasts of company activities and financial position in areas of income, expenses and earnings. Developed financial statements, analyze business trends and worked closely with the CEO of this start-up.
Jan 2007 - Feb 2011
Cpa
Mattila & Associates, Inc
Owner (Sold practice in 2007)Overall management responsibility for the operation of tax and accounting practice, including "hands-on" services performed for clients. Served privately owned companies in diverse industries, with annual revenues from $300,000 to $52 million; providing advisory, audit, tax, and write-up services. Interact directly with.
Jan 1994 - Jan 2007
Controller
Tellone Financial Services, Inc
Oversaw and directed accounting and financial services provided to high net-worth individuals. Supervised monthly closes; including financial statement preparation, budget analysis and reporting. Developed procedures manual documenting the process for providing accounting, audit, tax, and advisory services. Proved the ability to manage multiple assignments.
Jan 1988 - Jan 1994
Senior Auditor
Anderson, Lynn, Bezich, Munson & Cronick Cpa'S
Reported directly to the firm’s Audit Partner. Solid planning and supervisory skills in coordinating all aspects of each engagement from start to finish. Developed industry specific templates for the audit and review programs. Trained and supervised the audit and accounting department employees, as well as, working directly with them on projects. Designed.
Sep 1980 - Sep 1988
2 education records
William Mattila, Cpa education
Bachelor Of Science, Accounting & Business Administration
California State University, Long Beach
Financial Planning
College For Financial Planning
FAQ
Frequently asked questions about William Mattila, Cpa
Quick answers generated from the profile data available on this page.
What company does William Mattila, Cpa work for?
William Mattila, Cpa works for RMW ACCOUNTING, LLC.
What is William Mattila, Cpa's role at RMW ACCOUNTING, LLC?
William Mattila, Cpa is listed as Tax Director at Glenn B. Hetzel & Associates, CPAs, An Accountancy Corporation at RMW ACCOUNTING, LLC.
What is William Mattila, Cpa's email address?
AeroLeads has found 1 work email signal at @cox.net for William Mattila, Cpa at RMW ACCOUNTING, LLC.
Where is William Mattila, Cpa based?
William Mattila, Cpa is based in Mission Viejo, California, United States while working with RMW ACCOUNTING, LLC.
What companies has William Mattila, Cpa worked for?
William Mattila, Cpa has worked for Rmw Accounting, Llc, Glenn B. Hetzel & Associates, Cpas, An Accountancy Corporation, Karla Dennis & Associates, Redwitz, Inc., and Darrel Whitehead, Cpa'S.
How can I contact William Mattila, Cpa?
You can use AeroLeads to view verified contact signals for William Mattila, Cpa at RMW ACCOUNTING, LLC, including work email, phone, and LinkedIn data when available.
What schools did William Mattila, Cpa attend?
William Mattila, Cpa holds Bachelor Of Science, Accounting & Business Administration from California State University, Long Beach.
What skills is William Mattila, Cpa known for?
William Mattila, Cpa is listed with skills including Accounting, Internal Controls, Auditing, Tax, Quickbooks, Finance, Financial Statements, and Tax Preparation.
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