Westerlund & Mousa was founded in 1993 by Ann-Christine Westerlund and incorporated in 1998 as WESTMUSA Inc.

Our international approach is founded on many years of European and US tax and accounting experience.

Prior to 1993 Ann-Christine Westerlund was an International Tax Advisor and Partner at Ernst & Young in Helsinki, Finland and New York for 15 years.

WESTMUSA has a strong network and extensive contacts to other business related experts in the USA, Finland and Sweden.

  • We build up teams to deliver professional services wherever our clients need them.
  • We speak English, Swedish and Finnish.

WESTMUSA is conveniently located in Manhattan at Times Square in New York City.

The Ritz Plaza
235 West 48th Street, Suite 42B
New York, NY 10036

Tel: +1 212-582-3647
Fax: +1 212-586-4753
Email: westmusa@aol.com 


  • In the US: New York State Society of CPAs International Tax Committee
  • In Europe: KHT yhdistys – CGR foreningen, Helsinki, Finland