J.R. Simplot Net Worth

What was J. R. Simplot's Net Worth?

J.R. Simplot was an American entrepreneur, farmer, industrialist, and billionaire who had a net worth of $3.7 billion at the time of his death. He was best known as the founder of the J.R. Simplot Company, the Boise, Idaho-based agribusiness empire that became one of the most important potato suppliers in the world.

According to legend, Simplot quit eighth grade after getting into a heated argument with his father and took a job sorting potatoes and raising hogs until he had enough money to purchase his own potato field. By the early 1980s, he was worth $500 million thanks largely to a nearly exclusive contract to supply potatoes to McDonald's. Over time, that deal made Simplot one of the richest people in the world and one 10 richest people in America. Within a few years, he was a billionaire, and at the time of his death, his $3.7 billion net worth made him the richest person in Idaho. At the time of his death at the age of 99, J.R. Simplot was named the oldest billionaire in the United States.

Simplot helped commercialize frozen French fries on a massive scale, built a long-running relationship with McDonald's, and turned a regional potato operation into a sprawling private company with interests in food processing, fertilizer, mining, cattle, and agriculture. His business career was remarkable enough on potatoes alone, but it became legendary when he made one of the most unlikely tech investments in American business history.

In 1980, Simplot invested in a small Boise semiconductor startup called Micron Technology. He reportedly knew little about computers, but he understood commodity markets, capital-intensive production, thin margins, and the importance of becoming the lowest-cost producer. That instinct turned him into a billionaire twice over, first from potatoes and then from computer memory chips.

Portrait of J R Simplot (via Alamy)

Early Life

John Richard Simplot was born on January 4, 1909, in Dubuque, Iowa. He was one of six children born to Dorothy and Charles Simplot. When he was still a baby, his family moved west to Idaho, settling in the newly irrigated Magic Valley region. The family lived a hard frontier-style life, and Simplot grew up around farming, livestock, and the kind of rural self-reliance that would define his business personality for the rest of his life.

According to one of the most famous stories about his youth, Simplot left home at 14 after an argument with his father. His mother gave him a small amount of money, and he moved into a local hotel. There, he noticed that teachers were being paid in interest-bearing scrip but needed immediate cash. Simplot bought the paper at a steep discount and used it as collateral to borrow money from a bank.

He used the proceeds to buy hundreds of pigs. During a harsh winter, when feed was expensive, Simplot found a cheaper way to fatten the hogs by cooking potato scraps and wild horse meat into a kind of high-calorie slop. When he sold the pigs, he reportedly made more than $7,000, an extraordinary sum for a teenager in the 1920s. That early profit became the foundation of his first real business.

Potato Empire

After his initial success with hogs, Simplot moved into potatoes. He bought farm equipment, acquired land, and began building what would become one of the dominant potato operations in the American West. He never graduated from high school, but he had an instinct for machines, efficiency, and scale.

One of his early breakthroughs came through potato sorting. Simplot acquired an interest in an electric potato sorter, then won full control of the machine after a coin toss with his partner. The sorter gave him a major advantage in speed and consistency, allowing him to move more potatoes than competitors and expand aggressively. Within a decade, he had become one of the largest potato shippers in the West, with dozens of warehouses across Idaho and Oregon.

During World War II, Simplot's company grew rapidly by supplying dehydrated potatoes and onions to the U.S. military. He built large dehydration plants and became a major wartime food supplier. That business gave him the capital and infrastructure to expand into fertilizer, phosphate mining, cattle, animal feed, and food processing. He often integrated his businesses vertically. Potato scraps could become animal feed. Fertilizer could support his farms. Wood from company-owned forests could be turned into shipping boxes.

Frozen French Fries and McDonald's

Simplot's greatest food-processing breakthrough came from frozen French fries. Earlier attempts to freeze potatoes had produced poor results, but one of Simplot's researchers, Ray Dunlap, experimented with new techniques that made frozen fries commercially viable. Simplot was skeptical at first, reportedly believing frozen potatoes would turn to mush, but he changed his mind after tasting the results.

The timing was perfect. As freezers became more common in American homes and restaurants, frozen food became a major growth industry. In the mid-1960s, Simplot struck a handshake deal with Ray Kroc, the businessman who turned McDonald's into a global fast-food empire. Simplot agreed to build a dedicated factory to supply the chain with frozen French fries.

That relationship transformed the J.R. Simplot Company. McDonald's needed a consistent, scalable, low-cost fry supplier, and Simplot had spent his entire career solving exactly those kinds of problems. The company eventually became one of McDonald's most important French fry suppliers, and the deal helped make Simplot one of the richest people in America. He became so closely associated with potatoes that he drove around Boise in a Lincoln Town Car with a license plate that read "MR SPUD."

Micron Investment

In 1980, when Simplot was already in his 70s, he made the business pivot that turned his life story from remarkable to almost unbelievable. He was approached by twin brothers Joe and Ward Parkinson, who were trying to build a semiconductor company in Boise called Micron Technology. The company wanted to manufacture dynamic random-access memory, or DRAM, a critical type of computer memory chip.

On the surface, it made little sense. Simplot was a potato billionaire with no background in computers. But he understood the economics of the DRAM business better than many people in Silicon Valley. DRAM had become a brutal commodity market, especially because of competition from Japanese manufacturers. It required huge capital investment, efficient production, constant price pressure, and the ability to survive boom-and-bust cycles. To Simplot, that sounded a lot like potatoes.

He invested $1 million in Micron and received a major ownership stake that has often been described as roughly 40% of the company. He later put in millions more as Micron struggled to build its first fabrication plant and compete against much larger global rivals. His guiding philosophy was simple: become the lowest-cost producer of the highest-quality product.

Micron went public in 1984. During the 1980s, the company battled Japanese competitors who were accused of dumping memory chips at extremely low prices. Simplot, already frustrated by Japanese tariffs on potatoes, became an aggressive advocate for U.S. action against Japanese semiconductor imports. In 1986, the Reagan administration imposed tariffs on hundreds of millions of dollars' worth of Japanese chips.

By the mid-1990s, Micron had become one of the world's major DRAM producers, and Simplot was its largest shareholder. His $1 million investment had turned into a multibillion-dollar stake. In 1996, the New York Times reported that he controlled 22% of Micron, worth about $1.8 billion at the time. Around the same period, his total Micron holdings were often valued in the billions.

Simplot gradually sold down portions of his Micron stake over the years, and the J.R. Simplot Company used some of the proceeds to reinvest in its core agribusiness operations. He retired from Micron's board in 1999 at the age of 90, after nearly two decades of involvement. Even after the sell-down, the investment remained one of the great examples of a non-tech entrepreneur recognizing the economics of a tech industry before most outsiders understood it.

The story gained another remarkable chapter in May 2026, when Micron's market capitalization topped $1 trillion for the first time. Decades after Simplot first backed a tiny Boise chip company, Micron had become one of the most valuable semiconductor companies in the world.

Later Years and Other Ventures

Although Simplot stepped down as president of the J.R. Simplot Company in 1973, he remained deeply involved for decades. He later became chairman emeritus and continued to influence the company's direction well into old age. His company expanded internationally, moved into Australia, acquired food brands, and continued to grow in agriculture, fertilizer, and food processing.

Simplot also invested in other ventures. He helped finance Brundage Mountain ski area near McCall, Idaho, supported Bogus Basin, and invested in oil and other businesses. He loved skiing and remained active late into life. Despite his enormous wealth, he was known for a mix of flamboyance and frugality. He enjoyed dealing with powerful people and celebrities, but he also kept old glasses, resisted unnecessary expenses, and maintained the blunt style of a self-made farmer.

Personal Life and Death

Simplot married Ruby Rosevear in 1931 after meeting her on a blind date. They had four children: Richard, Don, Scott, and Gay. The marriage ended in divorce after Ruby left him for another man. Simplot later married Esther Becker, a former opera singer, in 1972.

For many years, Simplot and Esther lived in a hilltop home overlooking Boise. In 2004, they donated the residence to the state of Idaho for use as a governor's mansion, though it ultimately proved impractical for that purpose. The couple later lived at the Grove Hotel in downtown Boise.

On January 1, 2007, Simplot suffered a fall from a motorized scooter while attending the Fiesta Bowl in Arizona. He recovered and returned to Idaho, but his health declined in his final years. J.R. Simplot died on May 25, 2008, at his home in Boise after a bout of pneumonia. He was 99 years old. At the time of his death, he was the richest person in Idaho and one of the oldest billionaires in the United States. His legacy stretched from frozen French fries to memory chips, making him one of the most unusual and successful entrepreneurs of the 20th century.

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