Peter Zaffino and the art of subtraction

There were three minutes left in the second overtime when Peter Zaffino left his goal. Boston College was playing Harvard, a scuffle was developing, and the goalkeeper had gone to defend his teammates. Harvard’s Robert Bonnie noticed the opening. His shot travelled 50 yards into the empty net. The final score was 1-0.

It was October 1987, and the future insurance executive had acquired an early, rather public acquaintance with exposure. A college match cannot explain a business career. It does, however, provide a useful introduction to someone who would spend much of his working life deciding which risks an organization should carry. Sometimes the most consequential fact is what has been left unprotected.

Nearly four decades later, Zaffino is preparing for another change of position. He finished his time as AIG’s chief executive on June 1, 2026, then stepped down as executive chair and director on September 15. He remains a senior advisor. Palantir has announced that he will become its global head of financial services on January 15, 2027. The goalkeeper is heading into software, with a long insurance apprenticeship behind him.

A family business, in the broadest sense

Insurance was familiar territory before it became his profession. His father, Salvatore D. Zaffino, had been chief executive and later chairman of Guy Carpenter. Peter earned an economics degree at Boston College and an MBA in finance at New York University’s Stern School of Business. His early career included The Hartford and GE Capital; he joined Guy Carpenter in 2001.

By early 2008, he was Guy Carpenter’s president and CEO. The firm operates in reinsurance, where the customer is often an insurance company seeking protection of its own. It is a business that requires thinking about how losses accumulate across portfolios, rather than considering each contract in splendid isolation. An insurer’s promise to one customer can look very different when thousands of similar promises meet the same event.

In April 2011, Zaffino became president and CEO of Marsh, succeeding Dan Glaser. Brian Duperreault, then leading Marsh & McLennan, praised his “vision, tenacity and drive.” The assignment moved him from arranging protection for insurers to leading a broker advising companies on their insurance needs. It put him on another side of the same negotiation, closer to the buyer wondering whether the policy would do its job.

That progression matters. Zaffino had worked around the insurer, the reinsurer and the client before taking responsibility for AIG’s operations. He had also worked with Duperreault, who would become a central connection in the next stage of his career. In a business built around promises, knowing how the other parties think is a practical education.

The attraction of a difficult assignment

Duperreault arrived as AIG’s CEO in 2017 and brought Zaffino in as global chief operating officer that August. In September, Zaffino also took charge of General Insurance, its core property and casualty business. AIG came with a famous name and the accumulated complications of a company that had spent years restructuring after the financial crisis. The assignment offered ample opportunity to get underneath the numbers.

Zaffino wanted to form his own view. Describing his arrival in a 2020 interview, he said, “I needed to see things for myself.” That meant business review after business review. It is a revealing detail in a career often reduced to transactions and job titles: he began by examining the actual businesses, rather than accepting a ready-made diagnosis of the institution.

The partnership also had a recognizable division of temperament. RenaissanceRe chief Kevin O’Donnell described Duperreault as a calming influence and Zaffino as bringing tactical and strategic tenacity. Their acquaintance reached back further than the turnaround: O’Donnell and Zaffino had crossed paths at NYU’s business school in the 1990s. Insurance can be global and still have the conversational density of a small town.

The ambition to own less

Zaffino became AIG’s president in January 2020, CEO in March 2021 and board chairman in January 2022. His rise coincided with a changing definition of what the company should be. AIG’s life and retirement business became Corebridge Financial, which completed its initial public offering in September 2022. A separation that sounds tidy in a sentence required a series of decisions spread over years.

In June 2024, AIG relinquished its right to majority representation on Corebridge’s board and met the requirements to remove the business from its consolidated accounts. It retained an investment. That distinction is useful: separating a business can happen in stages, through ownership, governance and accounting, rather than in one satisfying ceremonial cut of a ribbon.

Another consequential subtraction came in November 2023, when AIG completed the sale of Validus Re to RenaissanceRe. It received $3.3 billion in cash, including a dividend before closing, and roughly $275 million in RenaissanceRe shares. AIG retained Talbot Underwriting and Western World. The choices were selective, down to which parts of an earlier acquisition would stay.

These moves give the Zaffino years their particular shape. Corporate ambition is often described in terms of additions: another division, another market, another acquisition. His record at AIG also asks what becomes easier to manage when an organization sheds a business. There is less romance in a carefully chosen boundary than in an empire. There can be considerably more clarity.

A turnaround has plumbing

The other part of the work happened inside the company. AIG 200, announced in 2019, was an effort to modernize operations, infrastructure and processes. The name referred to the company’s second century, an ambitious billing for work that included the distinctly unglamorous task of retiring old applications. Even centenarians have cupboards that need clearing.

The program achieved $1 billion in annual run-rate savings. At Investor Day 2025, AIG detailed changes that included eliminating 1,200 legacy applications and raising public cloud adoption from 20% to 80% in two years. It also described a $500 million investment in digitizing its commercial underwriting platform. These were changes to how the organization worked, reaching beyond the presentation investors would eventually see.

The underwriting record offers a way to examine the result. AIG reported five consecutive years of underwriting profitability during Zaffino’s CEO tenure. Its General Insurance combined ratio was 90.1% in 2025. In simple terms, a ratio below 100 means claims and expenses consumed less than the premiums earned, producing an underwriting profit. Investment returns are a separate matter.

The movement was uneven: 2024’s ratio was higher than 2023’s. An insurer still operates in a world of catastrophes, changing prices and estimates of claims from earlier years. A turnaround does not abolish those variables. Zaffino’s achievement has to be understood as a sustained change in the business, with colleagues doing the underwriting and operating work, rather than a promise of a smooth line forever.

The underwriter meets the language model

By March 2025, the discussion had acquired different company. Zaffino appeared at AIG’s Investor Day with Anthropic co-founder Dario Amodei and Palantir co-founder Alex Karp, in a discussion moderated by CNBC’s Sara Eisen. The insurer’s future was being discussed alongside the people building AI models and the software to put data to work. The earlier operating overhaul gave that conversation a concrete setting.

Zaffino’s explanation of the approach kept the human underwriter responsible for decisions. AI could extract information from documents and shorten the time needed to prepare an assessment. The attraction lay in improving the information reaching a practitioner and making the surrounding process faster. A large language model could help with the paperwork; someone still had to decide whether the risk belonged in the portfolio.

His public leadership advice was similarly concerned with the person doing the thinking. In 2024, alongside golfer Georgia Hall, he urged colleagues to “ask questions all the time.” He discussed mentorship and listening to different perspectives. These are the habits he advocates publicly, a useful companion to an operating record expressed in savings and ratios. They also leave room for the possibility that the next useful answer comes from someone else.

“ask questions all the time”

Peter Zaffino, on professional learning, 2024

A customer prepares to change sides

Sport remained part of AIG’s public life during his tenure. The company became title sponsor of the Women’s Open in 2019; the championship’s prize fund reached $9.5 million in 2024, up from $3.25 million before the partnership. Zaffino also promoted a leadership forum connecting women in insurance with senior colleagues. The sponsorship supplied a setting for conversations about opportunity as well as a place to put a company name.

His own transition arrived in stages. Eric Andersen succeeded him as CEO on June 1, 2026. Zaffino became executive chair, then left the board in September as John Rice took the chairmanship. The senior advisory role kept him involved in the leadership handover. It was a sequence of appointments and departures, with responsibility passing to other people rather than stopping at his desk.

Palantir’s announcement gives his next assignment a broader financial remit: insurers, banks, asset managers, private equity firms and other institutions. The start date remains in the future. His stated ambition includes helping organizations turn AI strategy into business advantage, with an emphasis on “building durable AI infrastructure today.” The buyer of technology is preparing to help deliver it.

The continuity is easier to see when the titles are put aside. At Guy Carpenter, Marsh and AIG, Zaffino worked on how organizations understand and carry risk. At Palantir, the announced job will concern the systems supporting financial decisions. The test ahead is whether the experience accumulated inside an insurer can travel. It is a question with a proper answer still to come, and enough work attached to keep a former goalkeeper occupied.