Who we are

Wing C. Quan, CPA

Wing's 30-year accounting career includes specialized experience in construction and real estate development. After working for several different firms, Wing opened his own accounting firm in 1994 and joined Hinton, Kreditor & Gronroos in 1997. He also has expertise in auditing and litigation support, mortgage lending and manufacturing and distribution.
He is a member of the American Institute of Certified Public Accountants and the California Society of Certified Public Accountants. Wing has a bachelor's degree in accounting from the University of Southern California (1976).

Amy S. Bertolini, CPA

Amy joined Hinton, Kreditor & Gronroos in 1998 with a specialization in providing accounting and tax expertise to small businesses. She serves clients in real estate development, construction, manufacturing and distribution, medical and dental groups, technology and professional service companies. She also specializes in the audits of not-for-profit organizations.
Amy received her bachelor's degree in accounting from California State Polytechnic University (Pomona) in 1996. She is a member of the American Institute of Certified Public Accountants and the California Society of Certified Public Accountants.

Leslie Sobol, CPA

Leslie began her accounting career with the international firm of Laventhol & Horwath. She left public accounting to become the Controller of a multi-state telecommunications company. Returning to public accounting Leslie joined a local firm where she developed her talent for mentoring, development and education of clients and their bookkeeping staff. She has a wide mix of commercial enterprises, multi-state corporations and tax-exempt entities. A graduate of California State University Northridge she is currently pursuing her Masters in Business Taxation at the same University.
Leslie's lifelong commitment to community involvement, team building, leadership and mentoring has been recognized by the Boy Scouts of America with the prestigious District Award of Merit and Woodbadge Beads for service and leadership. She is an active member of several social betterment and community groups.

Joseph Biag, CPA

Joseph has over 20 years in public accounting and specializes in auditing and consulting. He has expertise in providing services to growing, entrepreneurial companies in industries of retail, wholesale, manufacturing, construction and professional services.
Joseph received his bachelor's degree in accounting from California State University, Northridge in 1987. He is a member of the American Institute of CPA's and California Society of CPA's.

Nam Ook (Brian) Kim, CPA

Brian received his Bachelor of Arts from the University of California, Berkely in 1996 and his Masters in Business Taxation from the University of Southern California in 1998. He began his accounting career at KPMG, LLP working in the federal tax group. He later joined the firm Moss Adams, LLP. This regional firm provides a full range of accounting and tax services to midsized manufacturing clients.
Brian is a member of the California Society of Certified Public Accountants.

Raffi Galoustian, CPA

Raffi joined Hinton, Kreditor and Gronroos in 2006 with a specialization in providing auditing expertise to mid-sized, garment, and manufacturing companies. He has also provided auditing services to construction, real estate and restaurants. Prior to joining Hinton, Kreditor & Gronroos he worked as a controller for a service company with annual sales over 100 million dollars in 38 states.
Raffi received his bachelor’s degree in accounting from California State University Northridge in 1996. He is a member of the California Society of Certified Public Accountants.