How an Ex-Teacher Turned a Tiny Pension Into a Giant-Killer
A bold bet on rising rates lifted a small Massachusetts fund near the top of the performance rankings.
A bold bet on rising rates lifted a small Massachusetts fund near the top of the performance rankings.
Plymouth County is known for Pilgrims, cranberries—and a top-performing pension fund run by a 65-year-old former schoolteacher.
After a decade of mostly ho-hum performance, the $1.4 billion Plymouth County Retirement Association ranked in the top 10% of U.S. pensions over the past three years. Key to that success was an early—and prescient—bet that interest rates would rise. That buoyed the fund through big chunks of the past two years, when climbing rates hammered both stocks and bonds.
Now markets of all kinds have posted a six-month rally , stocks are hitting records and Plymouth risks falling behind again. But Peter Manning, the fund’s director of investments, is sticking to his guns. The hope that rates will fall soon is misplaced, he said. Another downturn could be coming for Wall Street.
And so, to Manning, the best way to enlarge the pension long term is by avoiding big losses, rather than chasing high returns.
“It ain’t about what you make. It’s about what you keep,” he said.
The fund, which manages savings for the county’s firefighters, bus drivers and custodians, delivered average annual net returns of 5.7% in the three years ending Dec. 31. That put it ahead of 92% of pensions nationally. The median U.S. public retirement fund returned 3.7% over the same period, according to Investment Metrics, a portfolio analysis provider.
Plymouth County surpassed bigger peers by slashing exposure to Treasurys and public stocks before they tanked in 2022. The fund then reinvested the money in infrastructure, private equity and inflation-protected debt.
While many other public plans have followed suit , the trades were also unusually quick for pension funds, which often change investments incrementally rather than in bold strokes.
“A lot of our clients made moves on the margin,” said Daniel Dynan, a managing principal at Meketa Investment Group, Plymouth County’s investment consultant. “The difference in Plymouth is the magnitude of the change.”
With only 10,500 members, the fund is an unlikely trendsetter. U.S. public pensions guarantee retirement and benefit payments to 34 million members nationally, according to data from the Urban Institute, a nonprofit think tank. Plymouth County, which lies south of Boston, encompasses mostly middle-class suburbs, but also some wealthy enclaves and gritty urban areas. It is split between Democratic and Republican voters.
A decade ago, Plymouth County had only about half of the money it needed to make expected payments for its retirees. An accounting change in 2012 drastically widened shortfalls for most public pensions across the country.
At the same time, the board overseeing the fund, which had spent years relying solely on an outside consultant, was dissatisfied with its investment performance. The approach resembled the classic mix of 60% stocks and 40% bonds popular with ordinary investors.
“We were doing what everyone else was doing, running a 60-40 portfolio and hoping for the best,” said Tom O’Brien, Plymouth County’s treasurer and chairman of the pension board.
The county hired Manning to advise the board on investment strategy in 2012. He had never managed a pension fund before.
“I was a schoolteacher [in the 1980s] in a suburb of Boston and one day, after staring at 20 vacuous stares, I had a talk with my Uncle Bill, a currency trader,” Manning said.
He spent two decades trading commodity futures at his uncle’s brokerage in Boston and stocks at brokerages in Chicago. Then he became a financial adviser to wealthy individuals and families at Merrill Lynch on Cape Cod.
The job at Plymouth County involved a small pay cut, but offered the opportunity to run a nine-figure portfolio for public employees. He got a taste of how painful rising rates could be in May 2013, when comments by Fed Chairman Ben Bernanke sent bond prices tumbling in what became known as the “taper tantrum.”

“We lost $20 million in three trading days and it took us 36 months of clipping coupons to make that back,” Manning said. Coupons are the interest payments bondholders receive.
Initially, Manning and O’Brien focused on boosting alternative investments such as private equity and infrastructure, which made up less than 5% of the fund. They were part of a flock of pension funds seeking alternative investments for higher returns .
Plymouth County hired Meketa as a consultant in 2015, and private-equity and infrastructure investments climbed to nearly 15% by 2020, according to fund financial reports. Returns improved.
“They have a level of comfort being different,” said Dynan.
Markets were on a tear the following year, lifted by the economy’s reopening from the pandemic. But Manning grew concerned in the summer about inflation. While many on Wall Street were calling price increases transitory, he worried inflation would persist, triggering rate increases and declines in stocks and bonds.
“We were going to conferences and being told that inflation was a paper tiger, or ‘this is not your father’s inflation,’” O’Brien said.
Manning consulted Bob Sydow, a high-yield bond fund manager at Mesirow who manages part of the pension’s money. Like Manning, he has worked on Wall Street since the 1980s.
“The money supply grew 43% over 26 months during Covid,” Sydow said. “I called it ‘free-range’ money and I thought it would generate a lot of inflation.”
From October 2021 to February 2022, Plymouth County pension sold about $80 million of its public stocks, or 6% of the fund’s assets, according to an email viewed by The Wall Street Journal. It shifted into real estate and infrastructure as well as short-term and floating-rate debt that is less sensitive to rising rates than traditional bonds, Manning said.
The fund lost 6.5% in 2022 while the median U.S. pension plan lost 14%. That outperformance has helped it stay ahead of other funds, even after it lagged behind the average in 2023.
Now, inflation remains above the Fed’s targets , and analysts’ forecasts for multiple rate cuts this year seem less certain. Plymouth County is keeping its strategy relatively unchanged, betting that rates will remain steady—or even climb.
Many investors are buying back into bonds because yields are at multiyear highs and they expect cuts by the Fed to trigger a rally. Manning takes a different tack. He thinks rates could stay high far longer than the Wall Street consensus, so he is using infrastructure funds to deliver income rather than bonds.
“Why do you have to own bonds at all in 2024?” Manning said. “It’s a legitimate question.”
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OpenAI has shelved the planned launch of GPT-6.1 Astra after internal tests raised concerns about deception and agents acting beyond user authorization, according to The Wall Street Journal. The company says it will investigate the issues and strengthen safety measures before releasing future models.
OpenAI says it is scrapping the release of its next-generation AI model over safety concerns that researchers raised during internal testing, in one of the clearest signs so far that agent misbehavior could stymie the industry’s rapid progression.
The move follows a summer punctuated by reports of artificial-intelligence systems industrywide going rogue, and marks a rare case of a major AI developer ditching a new release because of safety concerns.
The company had planned to launch the model, known as GPT-6.1 Astra, in the coming days or weeks, aiming for an October debut. The model was more capable than the company’s previous models in completing challenging tasks from end-to-end without human assistance, as well as writing.
The company instead will focus on improving the safety of future models, which it expects to be even more capable.
Saachi Jain, OpenAI’s head of safety systems, said in an interview that GPT-6.1 Astra regressed in two areas. Compared with its predecessor, GPT-6 Astra, the model performed poorly on tests measuring alignment, or how well the model adheres to what humans would like it to do. Specifically, GPT-6.1 Astra showed higher levels of deception: It wasn’t always honest about telling users of the actions it did or didn’t take.
Another issue was what OpenAI calls “scope authorization,” meaning that GPT-6.1 Astra would push ahead on a task without asking the user for permission, and would at times reach for external tools and services even if it might be unsafe.
“For anything regarding safety and alignment, there’s a trade off,” Jain said. “You really do need to find what’s the right line between staying within scope, but also avoiding laziness in terms of how the model actually pursues tasks even when it hits friction.”
While GPT-6.1 Astra improved in areas such as “model laziness,” Jain said it didn’t quite meet OpenAI’s bar for safety and alignment, so the company decided not to launch the model publicly.
The announcement comes one day ahead of OpenAI’s annual developer conference in San Francisco. In the past, OpenAI has used the conference as an opportunity to launch new models and services that reduce costs for software developers—a segment the ChatGPT-maker competes with rival AI company Anthropic to win over.
In recent weeks, OpenAI and Anthropic have called on industry partners to slow down the development of cutting-edge AI models and invest in safety standards, noting they will temper the pace of their own internal AI progress.
OpenAI says it is working to investigate a range of agent security incidents that it has discovered in recent months, and address the safety issues underneath them. As part of the work, the company has implemented a new monitoring system to catch AI-agent misbehavior more quickly, and started requiring engineers to use stronger security guardrails for testing its AI systems.
Earlier this summer hundreds of OpenAI’s internal agents, which were tasked with completing a cybersecurity test, ended up hacking into the AI company Hugging Face. Since then, high-profile organizations such as the Australian government and United Nations discovered that OpenAI’s agents used similar, but less extensive, techniques to gain access to their websites.
Many of the publicly known agent-security incidents involved OpenAI’s internal AI models that were never slated for public release.
Last week, OpenAI said it paused training on its most capable AI models after an AI agent slipped through a gap in the company’s internet restrictions to query a public chatbot. The company said its new monitoring systems flagged the incident within 15 minutes, and training on these models remains paused.
GPT-6.1 Astra isn’t one of those models, but a different case, the company said.
“We want to make sure our model development is safe no matter whether that’s in the company, or when we ship it to users,” Jain said. “But when we ship it to users, we have an extremely high bar in terms of safety and alignment.”
While the company decided not to ship GPT-6.1 Astra, it hopes to use the same base model to do additional reinforcement learning runs, and create future generations of its GPT-6 models.
OpenAI plans to conduct several deep dives to identify the root cause of the problems identified in GPT-6.1 Astra, Jain said. The work includes ensuring that OpenAI’s reinforcement learning environments are rewarding the right type of behavior, Jain added, though she noted the company would investigate all stages of model development.
AI companies have begun to draw scrutiny from policymakers and public officials, who are paying attention to the rapid development of the technology. Later this week, a Senate subcommittee is holding a hearing with third party AI researchers titled, “Rogue AI: Securing the Homeland Against AI Agent Attacks.”
Florida Attorney General James Uthmeier, a Republican, sued OpenAI in June, claiming that the company and Chief Executive Sam Altman knowingly released an unsafe product and ignored warnings that it could harm users.
In a motion for temporary injunction filed Monday, Uthmeier sought to prevent OpenAI from developing new AI models without third-party approved safeguards, stop ChatGPT from soliciting user engagement and limit the company’s ability to advertise ChatGPT as safe.
Tech companies claim they “cannot stop barreling forward with their potentially civilization-ending endeavors unless they are forced to do so by the government,” Uthmeier said in the filing. “The Florida Attorney General is answering your cry for help.”
An OpenAI spokeswoman said that people want to know AI is being developed safely, “and that starts with what companies like ours do ourselves.”
“Governments have an important role to play in setting robust safety standards for AI, and we’re committed to working with Florida and other states on advancing pragmatic AI policies that apply to the entire AI industry—not just one company,” she said.
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