H. Ross Perot, an eccentric Dallas billionaire whose two independent runs for president in the 1990s tapped into voters’ frustration with the major political parties and foreshadowed the rise of the tea party two decades later, died July 9 at his home in Dallas. He was 89.

The family announced the death in a statement but did not provide a cause.

The son of a politically connected cotton broker, Mr. Perot followed a long tradition of buccaneering Texas entrepreneurs. Following an unhappy stint in the peacetime Navy of the 1950s, he became a top salesman at IBM and was such an exhaustive peddler of computer hardware that he once met an annual sales quota in less than three weeks.

Mr. Perot went into business for himself in 1962 and made a fortune twice over, starting two software companies that each sold for billions of dollars. He received national attention for showering his largesse on efforts to aid or free U.S. hostages in conflict zones from Vietnam to Lebanon.

Cantankerous, suspicious and with a predilection for conspiracy theories, Mr. Perot gave voice to voter frustrations about wars, inflation and partisan politics. He offered himself as an ultra-patriotic “Mr. Fix It” who would “take out the trash and clean out the barn.”

A tangle of contradictions, Mr. Perot didn’t easily adapt to campaigning or the scrutiny it brought. He became rich from federal contracts while denouncing the size of government. He criticized the influence of lobbyists “in alligator shoes” while lobbying and winning a tax break for himself from congressmen to whom he had contributed. In 2011, Forbes magazine ranked Mr. Perot as the 99th-richest American, worth $3.4 billion.

When friends initially urged him to seek the presidency, Mr. Perot conceded that he was “temperamentally unsuited” for politics. It was his adamant opposition to the Persian Gulf War — in which U.S.-led forces drove Saddam Hussein’s Iraqi troops out of Kuwait in 1991 — that eventually prompted him to challenge the incumbent president and the Democratic nominee.

He announced his unorthodox campaign to CNN talk-show host Larry King, on condition that supporters get his name on the ballot in all 50 states and promising a campaign in which “we’ll get both parties’ heads straight.” Within minutes, his Dallas phones were so jammed that no one could call out.

Calling his grass-roots campaign United We Stand America, Mr. Perot attracted voters from all points on the political compass.

He capitalized on Bush’s failure to live up to his “read my lips” vow not to increase taxes. Speaking as a businessman, Mr. Perot said, “the chief financial officers of a publicly traded corporation would be sent to prison if it kept books like our government.”

Mr. Perot warned about the increasing national debt and, in the most memorable of his many pet phrases, bemoaned passage of the North American Free Trade Agreement, predicting it would produce a “giant sucking sound” of American jobs flying to Mexico.

He walked a tightrope on social issues: supporting abortion and gay rights (although he said he had never met a homosexual) and sex education in the schools (including distribution of condoms); opposing reintroducing prayer in the schools; and being evasive on gun control. But he saw little role for a president on such issues, saying they mostly should be left to the states.

By the summer of 1992, Mr. Perot was leading the polls with 39 percent, compared with 31 percent for Bush and 25 percent for Clinton.

Then in mid-July, he abruptly dropped out, saying the Democratic Party had “revitalized itself” and that he feared a three-way race would place the outcome with the House of Representatives. Nonetheless, on Oct. 1, responding to a “summons” from volunteers, he got back in, saying neither Clinton nor Bush had addressed the issues.

Mr. Perot’s on-again, off-again candidacy and talk of conspiracies enhanced lingering worries that he was a kook.

Among his unsubstantiated claims were that the George H. W. Bush administration knew that American POWs had been left behind after the war in Vietnam and that his hunt for them had been impeded by drug-running CIA agents; that he had been targeted for assassination by North Vietnamese officials and the Black Panthers; that armed hit men had broken into his Dallas compound but were chased by a guard dog; and that Republicans had distributed doctored photos of his daughter intended to smear her reputation and ruin her wedding.

As the Republican political analyst and commentator William Kristol put it, Mr. Perot was “not an entirely sane individual.”

His eccentricities extended to his choice of a running mate, retired Navy Vice Admiral James B. Stockdale. A highly decorated Vietnam POW, Stockdale quickly proved to be a liability on the campaign trail, infamously beginning the vice presidential debate by saying, “Who am I? Why am I here?”

Ultimately, Mr. Perot carried no state. His best showing was in Maine, where he edged out Bush for second place.

Four years later Mr. Perot ran as the candidate of the Reform Party, an organization he largely created and funded. He chose not to finance this campaign, instead accepting $29.2 million in federal funds for which he qualified as a result of his previous showing. He tapped a mild-mannered Washington economist, Pat Choate, as his running mate.

But by then the magic was gone. Clinton won a second term, easily defeating Republican Bob Dole, with Mr. Perot receiving just over 8 million votes, or 8.4 percent, less than half his 1992 total.

Henry Ross Perot was born in Texarkana, Texas, on June 27, 1930. His talent surfaced early: He qualified as an Eagle Scout in 13 months, a task that typically took three to five years.

At the Naval Academy, Mr. Perot was in the middle of his class academically, but he became a battalion commander and president of the graduating class of 1953.

After serving two years in the peacetime Navy, Mr. Perot tried unsuccessfully get out of the remainder of his four-year obligation. His main complaint was that promotions were based on seniority rather than merit.

In 1957, he took a sales job with IBM in Dallas. He quit when IBM ignored his ideas to not just sell computers but also service them and develop software.

In 1962, he founded Electronic Data Systems, taking supportive co-workers with him. EDS’s first contract, with the food company Frito-Lay, called for a computer system to be installed in two years. Working frantic, 80-hour weeks, Mr. Perot and his IBM alums completed the job in eight weeks.

When EDS’s stock went public in 1968 at 118 times earnings, many employees became instant millionaires. Mr. Perot sold EDS to General Motors in 1984 for $2.5 billion in cash and stock, and he joined the GM board. But he resigned two years later in a dispute over management practices, ridiculing fellow board members as “pet rocks” for management.

Mr. Perot next formed Perot Systems, which became a leader in health-care information technology. It had contracts with hospitals, physicians, insurers and the federal Centers for Disease Control and Prevention. He sold Perot Systems, with 23,000 employees, in 2009 to a family friend, Michael Dell, for $3.9 billion.

In 1956, Mr. Perot married Margot Birmingham, whom he met when he was a midshipman and she was a student at Goucher College outside Baltimore. In addition to his wife, survivors include five children; a sister; and 19 grandchildren.

For a person of such wealth, Mr. Perot led a relatively moderate lifestyle. He made his children bring their own popcorn to the movies, bought his suits at Men’s Wearhouse and ate at Dickie’s Barbecue Pit in Dallas.

His extravagances were jewelry for his wife and boats for himself. In later years he became a collector of Americana, cramming his office with Remington bronzes, Rockwell paintings, a Gilbert Stuart portrait of George Washington, and a copy of the Magna Carta that he sold for $21.7 million in 2007.