David Chang, CPA

David Chang, CPA

With Haskell & White since: 2017 David Chang is a Tax Principal at Haskell & White and has over a decade of public accounting experience. His expertise includes tax consulting and compliance services to corporations and high-net worth individuals. He services various domestic and foreign industries, including technology, manufacturing, and professional services. As a Tax […]


Joe Zhao, CPA

With Haskell & White since: 2017 Joe Zhao brings over a decade of public accounting experience to Haskell & White. He works primarily with real estate organizations that are structured as passthrough entities. Joe seeks to understand his clients’ long-range goals, and with that information, he can assist in developing a strategy to achieve the […]


Jim Katherman, CPA, CGMA

“Helping clients “look out the front window” on the road of business and life, anticipating and planning for ways to keep more of what they make and to enhance their business is the paramount service. That’s pro-active tax planning for clients, with tax and business guidance.”   With Haskell & White since: 2017 Jim has […]


David Brownstein, CPA

With Haskell & White since: 2012 David Brownstein, CPA, has over 10 years of experience in public accounting, including nearly three years at PricewaterhouseCoopers LLP. David has served private and publicly held companies of all sizes in a variety of industries including life sciences, manufacturing, real estate and technology. He has experience managing several of […]


Brian Stiefel, CPA

With Haskell & White since: 2007 Brian Stiefel, CPA is a Tax Principal at Haskell & White. He works primarily with real estate organizations organized as Partnerships, Limited Liability Companies and S‐Corporations providing tax consulting and compliance services. With over 10 years experience in public accounting, he has focused on tax advisory services related to […]


Ralf Eschenburg, CPA

Ralf Eschenburg

With Haskell & White since: 2019  Ralf Eschenburg is a Principal with Haskell & White LLP. Ralf leads Haskell & White’s International Tax Team and heads up our Credit & Incentives, including Research & Development Credit Practice Group. He is responsible for advising clients and prospects of the Firm about all aspects of international taxation. […]


Ryan Woodhouse, CPA

With Haskell & White since: 2004 Ryan Woodhouse is a Tax Partner and brings to the Firm more than fifteen years of experience providing corporate tax consulting and compliance services principally to emerging manufacturing/distribution, life science and technology businesses and their stakeholders. He frequently works closely with the audit team to calculate tax provisions for […]


Paul Louis, CPA

With Haskell & White since: 2007 Paul Louis is a Principal in the Firm’s Audit and Business Advisory Services Department. Paul joined Haskell & White LLP in 2007, after more than 6 years of experience in public accounting at Big Four firms. Paul has been advising primarily real estate, non-profit and technology companies – both […]


Patrick K. Ross, CPA

“Leadership starts with strong financial performance. Our clients count on us to serve as a dependable advisor and resource to improve their cash flow. At Haskell & White, your profitability is our passion.” With Haskell & White since: 1998 With more than 25 years of public accounting experience, Patrick provides a wealth of knowledge and […]


Diane E. Wittenberg, CPA

“Growing and developing our team is an integral part of our operating values and culture. By making the investment in our team, we are able to lead through exceptional client service and innovative new ways of delivering results.” With Haskell & White since: 2002 Diane E. Wittenberg is an Audit Partner in the Firm’s Audit […]