About Our Team

We're industry leading accounting and tax experts ready to help you navigate a complicated landscape.

We are a full-service sales tax management and compliance organization, based in Staunton, VA. Our team includes CPAs, MBAs, and CMIs (the highest designation for sales tax professionals). Together, we have over 100 years of experience in income tax, sales tax and tax technology. We specialize exclusively in the ecommerce retailing industry.

Peter Mantell, CEO

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.

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.

Eric Hsu, Senior Sales Tax Analyst (SALT)

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.


Jen Little, Director of Media and Public Relations

Jen is a seasoned communicator and creative thinker. She specializes in all media forms Ampersand Accounting, LLC to effectively communicate with our clients and educate the media on the myriad of topics relating to state sales tax and the impact on e-commerce retailers. She is an expert multicultural marketer, a social media ace, PR pro, and graphic designer.

Jen’s extensive media and public relations knowledge allows Ampersand Accouting, LLC to act immediately to disseminate information in this ever-changing sales tax environment to our valued clients, e-commerce businesses and works with the media.

Jen calls Virginia home, yet currently works from both Staunton, Virginia and Portland, Oregon due to the presence of Ampersand’s clients on the West Coast. The love of her life is the beautiful Chocolate Lab she rescued, Libby.

Jen is the point of contact for all media inquiries and can be reached via email at jen@ampersandaccounting.com