Experienced leader brings expertise in business interruption, catastrophe recovery and complex insurance claims

November 12, 2026  — Delta Consulting Group announced that William A. “Bill” Warren, CPA, CGMA, has joined the company as a managing director in its Insurance & Recovery practice. Based in Delta’s New York office, Bill provides expert services in the analysis, quantification and presentation of business interruption, extra expense and property damage claims, including complex catastrophe losses.  Bill also helps organizations quantify and communicate their realistic BI exposures and ratable values to better understand and differentiate their BI risk profile.

Bill brings extensive experience supporting major public, private and nonprofit organizations across North America, South America and Europe. His work includes first party property and business interruption, builder’s risk, owner-controlled insurance program claims, employee fidelity and fraud, third-party liability and other commercial disputes. He supports clients through complex claims and has participated in appraisal, mediation, arbitration and litigation.

Throughout his career, Bill has helped clients identify and document losses across multiple recovery mechanisms, including commercial insurance, the National Flood Insurance Program, FEMA, owner-controlled insurance programs, and special purpose claims facilities. He has managed claims involving hurricanes, floods, earthquakes, freezes, terrorist attacks and other major loss events, including large portfolios involving thousands of locations and multiple occurrences.

“I have known of and respected Bill for many years and I am excited to welcome him to our team. He brings an exceptional combination of technical depth, practical claims experience and an ability to manage complex losses across multiple locations and recovery mechanisms,” said Managing Director Drew Olson, practice area lead for Delta’s Insurance & Recovery practice. “His experience will further strengthen our ability to support clients through the financial, operational and strategic challenges that follow a major loss.”

Bill is also skilled at using technology to manage large data sets, automate financial analyses and accelerate the reconciliation of counterparty proposals. His experience spans chemical, manufacturing, mining, financial services, health care, technology, telecommunications, lodging, real estate, distribution, retail and other industries.

“I was drawn to Delta because of the opportunity to work with a growing team that understands the value of independence, provides the highest quality service, and combines claims expertise with construction, project advisory and other technical capabilities,” Bill Warren said. “Clients facing a complex loss need more than a calculation. They need a clear, well-supported strategy for documenting the loss and pursuing recovery. Delta is well positioned to provide that support through all phases of the claims process.”

Bill holds a bachelor’s degree in accounting from Babson College. He is a Certified Public Accountant and a Chartered Global Management Accountant.

“Bill’s arrival is an important addition to our continued investment in Insurance & Recovery,” Olson said. “His experience with large catastrophe claims, business interruption and technology-enabled analysis will be particularly valuable as clients navigate increasingly complex losses and recovery environments.”

To learn more about Bill Warren, visit Bill Warren’s profile.