Our Consultants

The ABS Consultant is the most important ingredient in the ABS formula for remarkable client service. Having the finest consultants in town is a top priority, as they are the ones that help solve customer problems above expectations.

Serge Gagne—Vice President, Financial Analytics and Data Sciences

fullsizerender-30With over 15 years working with many large, mid-market, and small companies, Serge provides exceptional financial analytics, business performance solutions, and efficiency expertise. His top-notch delivery of skills has earned him the well-founded moniker, “Excel Whiz,” from his clients and colleagues.

Using a Fortune 100 underpinning in the financial services, real estate, entertainment, and agriculture industries, Serge has mastered his analytical skills and his ability to “connect the dots” between Business and Data. Serge uses his Excel power-user expertise and Pivot Table financial-modeling mastery to create valuable reports, forecasts, and ROI analysis for business owners and management. With his data mining techniques, Serge can transform raw data into meaningful insights. Adept at using data to analyze a client’s markets and competition, Serge is a difference-maker for businesses that want to use strong data and financial analytics to beat their competition. Serge is an advanced user in Excel, and he is well-versed in project management and process improvement.

In his spare time, Serge enjoys playing high-strategy board games, and spending time using his Excel knowledge to create tools to edge and outperform other players in PC gaming.

William Hsieh—Vice President, Financial Analytics and Data Sciences


In a career dedicated to finance, accounting, and HR, William Hsieh brings 12 years of advanced financial and operational leadership to help businesses solve their problems and address their needs. AN advanced user of Excel, Access, and all Microsoft applications, with Six Sigma Yellow belt and Green belt certifications, and FINRA Series 6 and Series 63 securities licenses, William is able to provide an array of solutions in areas that include financial and performance metrics analysis, management reporting, financial planning, budgeting and modeling, and project management. Fluent in major accounting programs, such as QuickBooks, Peachtree, BPC and SAP, William is often a client’s first choice for plug-and-play day-one solutions. Managing budgets over $250 million for mid-market to large firms in the insurance, staffing, claims adjustment, training and education, and HR industries, William offers specialized solutions that are both broad and deep. William is particularly skilled at ROI, strategy and performance models, business KPIs and scorecards, IT budgets, logistics and efficiency workflows, rolling forecasts, and all areas of accounting, including monthly close, journals and accruals, and expense-variance analysis. Fluent in Chinese, William allows ABS to deepen its footprint in the Chinese market.

William holds a Bachelor of Arts in Economics from UCLA, and he is a graduate of the Farmers University Leadership Program. In his spare time, William enjoys playing basketball, supporting his UCLA athletics alma mater, having dinner and drinks with friends and family, and spending time with his daughter and wife.

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