Harold Hamm

Hamm was born in late 1945 to a sharecropping family in Lexington, Oklahoma, the youngest of 13 children. His father had only a third-grade education and worked as a part-time construction laborer and lay minister in addition to farming; the family moved from one tenant farm to another, raising crops and livestock. He did farm work from childhood and picked cotton with his family every fall, unable to start school until the last cotton crop was in.⁠[1][1][1][1][1][1]

At 16 Hamm moved from Lexington to Enid, Oklahoma, where he attended high school and worked at a Champlin service station. He has recalled that seeing the area’s oil and gas development and the generosity of oil industry leaders in Enid is what drew him to the business.⁠[2][1][1]

He did well in school but could not afford college; by 18 he was married with a family and worked for an oilfield service contractor and for Champlin Petroleum Company. He has recalled: “Absolutely, I started at the bottom, cleaning tanks.”⁠[1][1][2][1]

In 1967, at age 21, Hamm took up payments on a used tank truck and, with a $1,000 loan on a co-signed note, started a one-truck oilfield service business; by day he hauled drilling mud and water to rigs, by night he studied maps for oil plays, and he used the work to learn from local engineers and geologists. His first company was named Shelly Dean Oil Company. Continental Resources dates its formation to 1967; Hamm has been a director since its inception and was its chief executive officer until the end of 2019.⁠[3][2][2][1][2][2][4][5]

In 1971 Hamm made his first move into exploration, drilling a wildcat well in Alfalfa County, Oklahoma. The first well produced 20 barrels an hour and the second 75 barrels an hour, and the site eventually grew into a six-million-barrel field. He has said the field enabled him to go to college: “I didn’t go for the degree; I just went for the knowledge,” developing the geology skills he later used to find oil.⁠[1][1][1][1][1]

Through 1993 Continental Resources’ activities were focused primarily in Oklahoma; from 1993 it expanded into the Rocky Mountain and Gulf Coast regions.⁠[4]

After being diagnosed with Type 2 diabetes in his 50s, Hamm turned his attention to the disease. In 2007 his lead gift helped establish the Harold Hamm Diabetes Center at the University of Oklahoma (later the OU Health Harold Hamm Diabetes Center); he has since invested more than $50 million in it, and National Institutes of Health (NIH) research funding associated with the center has grown from $5 million to $33 million. The same year, Ernst & Young named him National Entrepreneur of the Year.⁠[6][6][6][6][1]

On May 14, 2007, Continental Resources completed its initial public offering at $15 per share. After the IPO Hamm beneficially owned about 72.8% of the outstanding common stock and remained the controlling shareholder. At the time about 82% of the company’s proved reserves were in the Rocky Mountain region, with key areas including Red River, the Bakken and Arkoma Woodford, and it used horizontal drilling and advanced fracture stimulation to develop unconventional resources such as the Bakken Shale. Continental Resources went on to become the largest leaseholder and one of the largest producers in the Bakken field of North Dakota and Montana.⁠[1][4][4][4][4][4]

In 2008 Hamm founded the Domestic Energy Producers Alliance (DEPA), an advocacy group representing independent producers, royalty owners and oilfield service companies, and became its chairman. He had earlier served as chairman of the Oklahoma Independent Petroleum Association from June 2005 to June 2007, and had been president of the National Stripper Well Association and founder and chairman of Save Domestic Oil, Inc.⁠[3][1][5][5]

From October 31, 2008 to November 3, 2009, Hamm also served as president of Continental Resources in addition to chief executive officer.⁠[5]

In 2011 Hamm was inducted into the Oklahoma Hall of Fame.⁠[1][2]

In 2012 Republican presidential nominee Mitt Romney vetted Hamm for energy secretary but decided against him because the two men differed on renewable energy sources such as wind. The same year, TIMETIMETIME is an American newsmagazine and media brand founded by Henry Luce and Briton Hadden, which published its first issue on March 3, 1923; it is headquartered in New York and known for its Person of the Year selection and the TIME100 list. Since 2018 it has been personally owned by Marc and Lynne Benioff; its current Chief Executive Officer is Jessica Sibley, and its Editor-in-Chief is Sam Jacobs.Open the full entry magazine named him among the 100 most influential people in the world, citing his creation of thousands of oil industry jobs and his support for education and diabetes research.⁠[7][1]

The divorce case between Hamm and his wife of 26 years, Sue Ann Arnall (a lawyer and economist also known as Sue Ann Hamm), began in 2012. In November 2014, after a trial of about two and a half months, an Oklahoma district court ordered Hamm to pay his ex-wife about $1 billion in cash and assets, one of the largest judgments ever in a U.S. divorce. Arnall, who argued the ruling let Hamm keep the vast majority of a marital estate worth up to $18 billion, appealed; Hamm also appealed, saying the judgment was excessive.⁠[8][8][9][8][8][8]

In January 2015 Arnall cashed Hamm’s $975 million check, the entire balance owed under the judgment. On April 28, 2015, the Oklahoma Supreme Court ruled 7–2 that by accepting the payment and taking possession of the marital property awarded to her, Arnall had forfeited her right to appeal; it dismissed her appeal while allowing Hamm’s to proceed. Two dissenting justices called the majority’s approach “draconian.”⁠[8][8][8][8][8][8][9]

In 2013 the Platts Global Energy Awards named Hamm CEO of the Year and Continental Resources Energy Company of the Year.⁠[1]

On December 18, 2015, the United States lifted its 40-year-old ban on crude oil exports; DEPA has been widely credited with leading the effort. Hamm has argued: “American energy is the best weapon against Russian aggression and OPEC dominance.” That year the Western Energy Alliance named him 2015 Wildcatter of the Year.⁠[1][1][1]

In 2016 Hamm received the Horatio Alger Award; the Horatio Alger Association is an educational nonprofit that honors individuals who personify the American Dream. He has said that success for him is “realizing your dreams, having a balanced life between your family and your business, and helping society when and where you can.”⁠[1][1][1]

On the evening of July 20, 2016, the third day of the Republican National Convention in Cleveland, Hamm gave a pro-Donald Trump speech on energy policy, criticizing environmental regulations and saying that electing Trump would remove government hurdles, untether the energy industry and create millions of jobs. He said: “Every time we can’t drill a well in America, terrorism is being funded.”⁠[7][7][7][7][7]

Sources close to the Trump campaign told ReutersReutersReuters is an international news agency founded in London in 1851 by Paul Julius Reuter and is now the news business of Thomson Reuters. It provides text, photo, video, and graphics coverage to media and institutional clients and distributes it through channels such as Reuters Connect.Open the full entry at the time that, if elected, Trump would consider naming Hamm energy secretary. Environmental activist Bill McKibben criticized Hamm as the country’s “fracker-in-chief.”⁠[7][7][7]

Since October 2017 Hamm has served on the board of directors of the National Fish and Wildlife Foundation.⁠[10]

Hamm stepped down as chief executive officer of Continental Resources on December 31, 2019, became executive chairman on January 1, 2020, and became non-employee chairman on May 19, 2021.⁠[5][5][5]

On October 16, 2022, Continental Resources signed a merger agreement with Omega Acquisition, Inc., a company formed by Hamm, for a cash tender offer of $74.28 per share for all shares not held by Hamm and his family. The offer expired on November 21, 2022, with about 62.5% of the relevant shares validly tendered; on November 22 the offer and merger were completed for total consideration of about $4.2 billion, the stock was then delisted from the New York Stock Exchange, and Continental Resources became a private company owned by Hamm and his family. Hamm became executive chairman from that date.⁠[11][11][11][11][11][11][5][5][5]

In April 2023 three class actions were consolidated in the District Court of Oklahoma County as In re Continental Resources, Inc. Shareholder Litigation. The plaintiffs, representing former shareholders, alleged that Hamm, certain trusts established for the benefit of him and his family and the company’s other directors breached their fiduciary duties in the 2022 take-private transaction, and sought damages.⁠[5][5]

Since August 19, 2025, Hamm has been chairman emeritus of Continental Resources, with Shelly Lambertz succeeding him as executive chairman. As of the end of 2025 the company operated in the Bakken field of North Dakota and Montana, the Anadarko Basin of Oklahoma, the Permian Basin of Texas and the Powder River Basin of Wyoming; in the first quarter of 2026 it acquired assets in the Vaca Muerta shale play in Argentina’s Neuquén Basin, its first move overseas.⁠[5][5][5][5]

In the second quarter of 2026 the parties to the take-private class action reached a settlement without any admission of liability, wrongdoing or fault; the settlement takes effect only once approved by the District Court of Oklahoma County, and if approved Continental Resources will pay a total of $60 million, of which $23.5 million is expected to be recovered through insurance. As of the quarterly report filed on July 31, 2026, the settlement was still awaiting court approval.⁠[12][12][12]

In summer 2026 Hamm merged DEPA into the much larger Independent Petroleum Association of America (IPAA); an IPAA spokesperson said he had expressed an interest in becoming its chair. Donald Trump has referred to Hamm as his “original oil guy.”⁠[3][3][3]

On September 22, 2026, the University of Oklahoma announced a $150 million gift commitment from Hamm, the largest single gift in its history: $50 million for the Harold Hamm Diabetes Center ($30 million to support the priorities of new executive director John P. Kirwan and $20 million for capital improvements and research infrastructure) and $100 million for the broader academic and research enterprise of the Oklahoma City Health Campus. The campus was renamed the Harold Hamm Health Campus, and Hamm became the largest individual donor in the university’s history, with lifetime giving approaching $250 million.⁠[6][6][6][6][6]

Hamm said: “Oklahoma has given me more than I could ever repay, and I can think of no greater investment than in the health and lives of its people.”⁠[6]

Hamm established the Harold Hamm International Prize for Biomedical Research in Diabetes, and in Washington advocated for more affordable insulin, supporting the Affordable Insulin Now Act, which sought to cap patients’ out-of-pocket insulin costs at $35 per month. He is a signer of The Giving Pledge and supports the Harold Hamm School of Geology and Geological Engineering at the University of North Dakota.⁠[6][6][1][1]

Continental Resources: Official website: https://www.clr.com/ (opens in a new window).⁠[5]