Our modern firm is versatile, adaptive and knowledgeable with high standards, responsive service and specialized staff, we spell the difference between Firms in our unique approach.

We believe in integrity, honesty, and accountability at our Arizona accounting firm. Our firm’s reputation reflects the high standards we demand of ourselves.

With many years providing tax and accounting services we are committed professionals.

Our professionalism speaks for itself as we are highly recommended in the Phoenix metro area and across Arizona.

Your IRS tax problem receives the attention of our tax professionals who have over 200 plus years of combined professional tax experience. We can provide immediate representation and stop the intrusions into your business and personal life.

Alysia R. Dahir, MBA
President & CEO
Former IRS Agent

Alysia has held positions with the Federal Government in The Department of Treasury (IRS) and The Department of Defense (Academic and Military Projects Army/Navy) along with global corporations in her early work as an Agent, Accountant and Analyst. She was a Revenue Agent.

Her combined 18 years of government service, corporate accounting and individual business consulting define her as a leader. She has extensive experience with income tax preparation for individuals, corporations, partnerships, non-profits, estates and trusts, foreign expats, start-ups and community property.

She is a leader, demonstrating a rich knowledge in finance and accounting concepts/principles. Speaking to her character for authenticity she works with diverse groups of clients and companies. Her strategic goals are to align with business needs and targeted business solutions. Importantly she champions and commands strong advocacy of knowledge sharing and teams.

She also has a rich knowledge of the IRS being a former IRS Agent and knows the in’s and out of the IRS system

Pursuant CPA ~ Engagement at USC, LA
Executive ~ Sustainable Business/System Sciences and Anthropologist, Pinchot, Seattle
MBA~ Intl Bus & Fin Western Intl, AZ
BS ~ Accounting WPCarey ASU, Tempe

Professional Certifications, Associations and Memberships
American Institute of Certified Public Accountants(AICPA) ~ Member
Accounting & Financial Women’s Association (AFWA) ~ Member
National Tax Professional Association (NTPA) ~ Member
Beta Alpha Psi (Collegiate Accounting Society) ~Alumni
Arizona State University ~ Alumni
Fountain Hills Chamber of Commerce ~ Member
Networking 360 ~ Member
Center for Nonprofit Excellence ~ Member
Personal and Civic Activities
Curator ~ Syntony International
Organizer ~ TEDx Fountain Hills
TEDWomen ~ Events
TEDSummit ~ Events
TEDxRoma ~ Adventures
TEDxBeaconStreet ~ Adventure Catalyst
CoFounder, CFO ~ DQDinc (Education Non Profit)
Certified Educator AZ
Project Director ~ Arizona Consortium for the Arts

Michael D. Sullivan
Former IRS Agent

Michael D. Sullivan

Michael D. Sullivan is the founder of Michael D. Sullivan , Former IRS Agent. He had a distinguished career with the Internal Revenue Service for 10 years. As a veteran IRS Revenue Officer / Agent, he served as an Offer in Compromise Tax Specialist and Large Dollar Case Specialist. He also collaborated with the U.S. Attorney’s office on undercover operations. Michael received several awards for his work and dedication as an IRS Agent.

During his tenure with the IRS, he was a Certified Tax Instructor who taught out of the Atlanta Regional IRS Training Offices. He also taught out of the local and district offices of the IRS. Mr. Sullivan trained many of the new IRS Agents.

Michael has been in private practice for the last 35 years in the field of Taxpayer  Consultation for IRS Audit and Collection tax resolution issues. He often consults with corporations and individuals, which involves a wide range of tax issues.

Michael has worked many large complex cases for high net worth individuals and large corporations. Mr. Sullivan is a committed professional with dedicated involvement in the tax profession community as a frequent speaker on the South Florida circuit and also served as an officer and on the Board of the Greater South Florida Tax Council. Michael has been the program host and moderator for several Internal Revenue Service forums both in the public and professional sectors.

Mr. Sullivan also teaches courses for Attorneys, Lawyers, and CPA’s for continuing education.

For Attorneys and Lawyers, Course number 1708462N to the members who have completed “IRS Tax Resolution”.  Florida Bar members can report their CLE credits online at www.floridabar.org.

CPA CE Provider application 1769 and your CPA CE Course application were both approved on 11/28/2017. Your provider number is PVD990 and your course number is CRS22227.

Mr. Sullivan has been a featured speaker in the credit card industry, student loan and the debt settlement vertical as well. He also was one of the featured speakers at the Latino Tax Fest which also featured Nina Olsen, Nation Taxpayer Advocate.

Mr. Sullivan has also appeared on FOX BUSINESS NEWS


Mr. Sullivan has also appeared on NBC.


Mr. Sullivan has appeared on ABC Washington, The Briefing Room, comments about The Releasing and Audit of Donald Trumps Tax Returns.

https://www.youtube.com/watch?v=WrxAgkfIgkg&feature=youtu.beMr. Sullivan has also appeared on NBC News, Houston.

Professional Associations  & Registrations

Dun  & Bradstreet  D-U-N-S # 05-928-3511 – Five Star Rating

SAM (System Awards Management) is active #  059283511/8DFH1

Department of Business and Professional Regulation Provider # 0007530

Lic Type: 0104

I/O: 11565185

Appl # 25498

File # 25238

DBPR License Type:  CPA Course Provider

DBPR Rank:  Provider

License Number:  PVD990

Bureau of Education and testing:

Teaching course number for credit hours: 0022709

Course Title:  IRS TAX Representation

Course Hours:  2 credit hours

The Florida Bar Certificate of Accreditation for Continuing Legal Education: 

Michael D Sullivan Reference Number:  1708462N

Title:  IRS Tax Controversy & Resolution

Level Intermediate

General CLE Credits:  1.0

Tax Law Certification Credits 1.0

Registered with the Following:

The Florida Department of State

The Florida Market Place

The Internal Revenue Service as a Former Agent and Teaching Instructor

North American Industry Classification System (NAICS – SAM approved)

The Federal Acquisition Regulations (FAR -SAM approved)

The Commercial and Government Entity (CAGE- Sam approved)

US Department of Homeland Security (FEMA – SAM approved)

The Department of Defense (DOD- SAM approved)

Personal Info:

Michael graduated from St. Thomas University with a B.A. in Pre-Law. He also has attended Knox Theological Seminary.

Mr. Sullivan has obtained a Life Time Achievement Award for Little League Baseball and currently sits on the International Board for the Walk to Emmaus. Michael also is a proud member of the Life Work Leadership program.

Mr. Sullivan was the former District Leader of the United Methodist Church, SE District for the Florida Conference and served on the Board of Lay Ministry.

Michael is very active in the various ministries of his church where he can be found leading and teaching Biblical Studies. He has been the Southeast Florida District Lay Leader of the United Methodist Church and the Florida Annual Conference.

Mr. Sullivan also appeared on Net Grace FM, for the Christian Business Weekly show.

Mr. Sullivan has also received and been awarded “The Diocesan Synod Grand Patriot  Diocese Award” in Lagos, Nigeria.

Mr.Sullivan formerly sat on The Mobil 1 Twelve Hours of Sebring International Raceway Advisory Council (SIRAC).

He is also an avid bass fisherman, has a commercial racing license, and can be found on occasion skydiving. He has also coached 12 of Little League Baseball, JV Football at Cardinal Gibbons High School, Roller Hockey, Flag Football, Soccer and Basketball.

*Mr. Sullivan has been in private practice since 1983 in South Florida which gave roots to Michael D. Sullivan , Former IRS Agent. The firm began as Sullivan & Powell PA and through the years transitioned to its now current form.

Curtis Robertson, CPA

Certified Public Accountant, Controller to Dahir Tax & Accounting Firm. Outsources as CFO and is the owner of his own accounting and tax firm. Curtis Robertson likes helping people get organized, creating savings by implementing efficient processes, and optimizing the use of financial resources.

Besides being a Quickbooks Pro Advisor, he  and is also experienced with SAP, Lacerte, Appfolio, Yardi, CYMA and several other accounting software solutions.

Curtis draws on his Big 4 experience, over 18 years in practice including five years of independent tax preparation and consulting experience with both individual and business reporting. He managed a portfolio of 200+ business and individual tax returns.

In his personal time he delights in working with his children to develop their talents in sports and music. To be an influential part of his children’s learning experiences he coaches many of their teams from which he derives a lot of personal fulfillment. Similarly, he seeks opportunities to coach his clients to be more successful not just by serving them, but also by training them to better utilize the systems and tools they already have and save the cost of paying others to do it for them.

Curtis is uniquely qualified to relieve stress for you by setting up and establishing an excellent accounting framework, controls and streamlining existing processes, which cuts costs, and saves time. Curtis will partner with you to achieve and surpass your business goals.

Contact Curtis Robertson today to get started organizing your financial life.

  • Save on taxes
  • balance books
  • design and implement controls
  • prepare financials for bank & investors
  • project cash flow
  • advise in making efficient use of capital
  • advise start-up companies

Tim Hensley

Tim is an Advisor at Dahir Tax & Accounting Firm. Currently he is an area manager with Cornerstone Estate Plans, the Executive Director of Genesis Housing Services, a non-profit counseling organization and the CFO and an instructor for Advancing Achievers Technology & Cyber Security University.

Tim coaches CPAs to become leaders while using his rich knowledge in finance and accounting concepts/principles.

He is also a published author of two books; the first, “Life Income: Growing, Protecting and Preserving Your Wealth” and the second, “The 7 Critical Steps to Financial Stability, Moving From Financial Crisis to Financial Stability In Your Life.” Here he challenges the traditional advice given in both business and personal finances. We encourage you to “Take a read”.

Tim worked in the clinical setting for many years working with families where abuse had taken place. At that time the medical insurance industry was going through significant changes and he left the clinical setting, entered into the financial industry in 1984 allowing him to use both his clinical skills, caring for people, and helping businesses and individuals save on taxes and manage their money.

Tim grew up in San Luis Obispo, California and at the age 18 left home to play and teach tennis (now coaches and plays pickleball ). After several years, he returned to college, completing his undergraduate work at BIOLA University in Southern California. He finished with a Master’s Degree in Clinical Psychology from the International College of Los Angeles.

Mirelle Wright
Office Manager

Mirelle Wright is the Office Manager with Dahir Tax & Accounting Firm.  Prior to joining the Firm, she was a Paralegal with Pew Law Center and program specialist advisor at Maricopa Community Colleges.

During her time working with the Mesa Community College Red Mountain Strategic Planning Committee. She assisted on developing the Strategic plan for the next 5 and 10 years. Her strengths are in coordinating and researching the environmental, technological, social, political/legal, and global factors, the demographics, and am currently coordinating getting the focus groups planned.

What’s personal to Mirelle is her passion to help domestic violence survivors and educate people on the impacts of PTSD. Her dog Sadie is her emotional support animal and a saving grace.

Samantha Morton
Staff Accountant

Samantha Morton is a Staff Accountant with Dahir Tax & Accounting Firm. Prior to joining the Firm she was a Director for a medium sized construction company. Additionally, she has been working with other small business in the Accounting and Human Resources areas. Her extensive knowledge of QuickBooks, billing, accounts receivable as well as writing Policy and Procedure and other manuals for companies is welcomed to our work processes. Her number one priority is to give clients the most detailed and accurate results in a timely manner. She assists companies and individuals by organizing the details so they can Focus on the Big Picture.

Samantha walks to the beat of her own drummer, she spends part of the year abroad while maintaining a work life balance enriching her family and herself with a bigger vision of what is happening in the world. The ability to work virtually while delivering quality results for her clients locally and internationally is her goal.

In her life she is an accomplished authority in the Gaming and Hospitality industries as well as consultant speaker, writer, non-profit co-founder and life coach. She also enjoys working as the Executive Producer to TEDxFountainHills with Alysia who is the Organizer since 2014.


Julie Lynch recently retired after a 38-year renowned career as a Revenue Officer in the Collection Division of the Internal Revenue Service. During that time, she worked collection cases involving both individuals and businesses, and handled all aspects to resolve the cases; from securing OFfers-in-Compromise, installment agreements, reporting cases currently not collectible and requests for abatement.

She worked closely with all divisions within the IRS, including Examination Division and Taxpayer Advocate. She also met regularly with representatives of both the U. S. Attorney’s Office and the IRS Office of Chief Counsel. Julie taught several IRS classes, was an On-The-Job Instructor for new employees; and as a senior Revenue Officer, she acted as a mentor to lower graded employers.

She was often called upon for her expertise to assist with other departments within the Collection Division, as well as assisting employees within her group.

During her tenure, she received yearly Performance Awards, as well as a Regional Commissioner’s Award and a Certificate of Appreciation from the Secretary of the Treasury.

At the time of her retirement, she received the Albert Gallatin Excellent Service Award from the Secretary of the Treasury.

Farren Holmes
Staff Accountant

Before joining the practice Farren was pursuing her degree in accounting with ITT Tech and Folsom Lake College. Her business experience is accounting services including general ledger, financials, document preparation and general tax.

Farren strives to make a difference in the world of the clients to provide an overall understanding of financial wealth. She demonstrates this on a basic level through education and financial literacy working together with her local school district.

Based out of Northern California, Farren serves clients remotely as well as in person. Farren has a passion for numbers and enjoys solving puzzles and learning. Helping family and friends with their books and taxes revealed a passion for this field, creating a business around this love for numbers.

Farren loves to express her creativity through landscape photography in the stunning scenery near her home in Northern California. An avid reader and art lover she is active in her communities Art Council.


Professional Certificates, Associations & Memberships

California Registered Tax Preparer

QuickBooks ProAdvisor

Certified in QuickBooks Online

Xero Advisor


Certified with Hubdoc

National Association of Certified Public Bookkeepers – Member

National Association of Tax Professionals – Member

Superintendents Leadership Advocacy Team – Member

*Not everyone employed is listed. Other administration that work with us are not listed.