Accounting & Sales Tax Professionals

Our Expert Team


We offer a full line of accounting services with automations and sales tax solutions.


We will communicate and educate your team as to the processes that we are following and the why to show reasoning for all our tasks.


Meet our team, 100% remote working all over the world to bring together world class experts.

Wisdom of the \”And\”

“Skate to where the puck is going, not to where it’s at.” – Wayne Gretzky

Peter Mantell


Peter is an executive with over 10 years’ experience in developing and implementing market penetration strategies for organizations ranging in size from start-up to over $300 million in annual revenue. He previously held international management roles for leading education tech companies.

Peter has extensive experience in the ecommerce industry as a result of operating his own ecommerce retail business prior, and now as a successful and well-known wholesaler/distributor to hundreds of ecommerce retailers. He is a member of several ad hoc groups of wholesalers and ecommerce retailers who regularly communicate to share and compare industry best practices.

Peter holds a bachelor’s degree in Business Administration from Southern Virginia University.


Wisdom of the \”And\”

We work as a team with staff to ensure all your accounting needs are met.

Ken Helms

Partner (SALT)

For the past 20 years, Ken has worked in the indirect tax arena as a state auditor, consultant, and process owner. His experience includes state and local sales and use tax, state and local occupancy tax, federal and state telecommunications tax, federal, state and local motor fuel excise tax, local business licenses, and several other indirect taxes. He is also well- versed in the application of Six Sigma process design and implementation in the indirect tax function.

Previously, Ken held indirect tax leadership roles at United Technologies and Intercontinental Hotels Group. He currently is the Principal at Indirect Tax Solutions, a company he founded in 2013. Indirect Tax Solutions identifies and designs custom deliverables for indirect tax departments documenting real dollar, enterprise value to the organizations.

Ken holds a Bachelor’s Degree in Accounting from Eastern Illinois University. He is a Certified Member (CMI) of the Institute for Professionals in Taxation. He resides in Atlanta, GA.


Wisdom of the \”And\”

“If someone isn’t making you stronger, they’re making you weaker.” – Tim Ferriss

Eric Hsu

Partner, COO

Eric Hsu started his career with the California State Board of Equalization and worked in the San Jose and Sacramento Out-Of-State District offices. He left the Board as a Senior Tax Auditor with the Interstate Commerce Analysis Team (ICAT). Eric was part of a team who investigates leads to determine if an audit is warranted. Eric moved on to work for a multi-state SALT company where he was a Senior Tax Consultant where he advises on SALT issues.

Eric holds a Bachelor of Science degree in Accounting from San Jose State University.


Wisdom of the \”And\”

“Fear doesn’t exist anywhere except in the mind.” – Dale Carnegie

Steven Leung

Jr. Salt, Manager of Compliance Team

Steven has ten years of sales and use tax experience. He started his career with the California State Board of Equalization in the San Jose district office as a Tax Technician before moving to the Use Tax Administration Section of the BOE in Sacramento as a member of the U.S. Customs Group. His final years were spent as a Business Taxes Representative in the Return Analysis Unit of the California Department of Tax and Fee Administration where he performs desk audits of gas, diesel, and jet fuel sales and use tax accounts.

Iris Chen

Wisdom of the \”And\”

“If you have good thoughts they will shine out of your face like sunbeams and you will always look lovely.”― Roald Dahl

Iris Chen

Filing Team Manager

Iris has been with Ampersand since 2019. She plays a vital role in ensuring filings are being accurately reported and remitted on time. Iris manages and trains a team of filers. When Iris isn’t busy working on client filings, she enjoys spending time with her cats.


Wisdom of the \”And\”

A person who never made a mistake never tried anything new. – Albert Einstein

Ralp Dela Peña

Sales Tax Compliance Associate and Lead Support

Ralf Dela Pena has five years of experience in the eCommerce industry with a keen understanding of global business flows.

Ralf’s extensive sales and use tax knowledge enable Ampersand to properly service its clients through various stages of the taxation process.

While leading Ampersand’s support team, Ralf has excelled as a trainer for new staff utilizing his unparalleled and meticulous organizational skills. With over 10 years of customer service experience, Ralf ensures that the company is consistently delivering satisfaction, care, and compassion to its valued clients. He has worked with every state that collects sales tax making him tremendously knowledgeable in the area of sales and use tax compliance.

An avid outdoorsman and community activist, Ralf holds his work in the highest regard second only to his lovely puppy, Britney.

Chris Dagpin

Wisdom of the \”And\”

“Choose to Be Extraordinary”

Chris Dagpin

Accounting Extraordinaire

Chris is an e-commerce enthusiast with a keen understanding of local and global e-commerce process flows. With his years of experience in customer service and a meticulous eye for detail, he provides and maintains a high level of professionalism for the company and clients. His personal experience, comprehensive knowledge, and non-stop learning in the e-commerce industry enabled him to handle sales and use tax matters with expertise.

Chris holds a Bachelor’s Degree in Political Science.

“He’s a big fan of Elon Musk and believes humans can be a multi-planetary species one day. “