Diana Cheng-Masamitsu

Diana Cheng-Masamitsu

Associate Payroll Director

Diana is a human resources professional with nearly 20 years of experience. She specializes in payroll and benefits administration.

Diana holds expertise in the following areas:

  • Payroll accounting
  • Multi-state/foreign payroll
  • Benefits, 401(k), and stock administration
  • Federal, state, and local payroll tax compliance
  • HR administration
  • Worker’s compensation
  • HRIS/Payroll systems

Before joining Seiler in 2020, Diana managed payroll and client billing for a leading light industrial recruitment staffing agency, Cornerstone Staffing Solutions, as a Client Billing Manager. Diana is experienced working with small and mid-size organizations. Diana also served as the Director of Core Services at BackOps, where she led teams of HR, payroll, benefits and accounting professionals, delivering day-to-day virtual back-office support to venture-backed startups. She also previously worked at Newco Solutions, Telegent Systems USA, and LSI Logic Corporation.

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Professional Memberships

  • American Payroll Association
  • California Society of Certified Public Accountants


Education / Certification

  • Bachelor of Science in Business Administration-Management, San Jose State University


Community Affiliations

  • Girl Scouts of Northern California, troop leader volunteer
  • Ohlone Humane Society, foster volunteer