John Ismerio ISTAXPro

John Ismerio, MBA

Founder & CEO

20 years of providing tax and accounting services.

John has been helping small businesses and non-profits to achieve their goals.


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Rose Ismerio, BA

General Manager

Managing partner and officers for ISTAXPro.

With her 13 years of experience, Rose devoted to help and engage with all business owners regardless the size.


Marco Ang

Junior Accountant

Marco assists broad scope of services from tax preparation to QuickBooks for Business.

His goal is to provide efficient and accurate services for ISTAXPro's clients

Chau Ton

Junior Accountant

Chau's passion in Accounting makes her duties an exciting one. She assures that tasks are done precisely.

She wants to help clients by giving informative helpful data.


Robert Perez

Junior Accountant

With his strong customer service skill, Robert is providing quality tax preparation experience.

He contributes on updated tax research in order to give best tax planning for the clients.

Flor Sanchez

Junior Accountant

10+ years experience in Credit Analyst field, Flor expands her horizon in tax and bookkeeping services.

Speaking fluent English and Spanish, Flor hopes to add values for local and national clients.


Cecilia Zavala

Junior Accountant

As an accounting enthusiast, Cecilia combines her administration skill and experience to give best accounting services.

Cecilia also provides pleasant ideas to help all ISTAXPro accountants.

Gilberto Gutierrez

Junior Accountant

Gilberto intends to learn as much as he can while attending CSUN and working with John at ISTAX. His ultimate career goal is to use the knowledge he has gained throughout the years to one day open up his own full-scale business. 

His hobbies include traveling, hiking, and photography


Christine Hernandez

Junior Accountant

In the next few years, she hopes to get her CPA license and to have a blossoming career in private accounting. 

 In her free time, she likes to go hiking, camping, driving by the coast or up the mountain to sightsee, kayaking, and snowboarding.

Liana Sahakyan

Junior Accountant

Liana is expecting to graduate from the California State University of Northridge in summer 2022. After graduation, she plans to obtain her CPA license and earn an MS in Taxation.

 In her spare time, she enjoys making scented

candles, editing photos, and traveling.


Hank Tu

Junior Accountant

Hank's professional and personal goal is to broaden his accounting skill set, improve his work quality, and most importantly learn from those who came before him. 

His hobbies include golfing, horology, and investing.

Ashley Hernandez

Junior Accountant

Ashley is passionate about her work. She thrives on challenges and constantly sets goals for herself, so she has something to strive toward.

 She recently began taking piano lessons and looks forward to her classes.