A phantom billionaire is haunting America's mountain wilderness: Now our investigation brings mysterious heir and his 'toy box' plan out of the shadows

By JAMES REINL, US SENIOR REPORTER Published: 01:43, 12 July 2026 | Updated: 01:44, 12 July 2026 He possesses the world's tallest privately owned mountain, has a $9million Houston mansion, and is spearheading the massive redevelopment of Boston's historic racecourse. But William Bruce Harrison is not making any friends in rural Colorado. The 39-year-old oil heir has erected 26 miles of 8ft-tall barbed wire fencing around his 83,000-acre Cielo Vista Ranch in the San Luis Valley – and has plans to build a billionaire's 'toy box' to house a fleet of ATVs, snowmobiles and a private helicopter.  The Texan has claimed the fence is simply for keeping his bison in and trespassers out, but hundreds of families who have utilized the mountain for generations have declared it a war against their ancestral lands.  'He is not a good neighbor,' Shirley Romero Otero, 70, one of the heirs to the Sangre de Cristo Land Grant, told the Daily Mail. She has been fighting for her community's rights to the mountain for five decades and co-founded the La Sierra Environmental Guardians Committee. 'It's a message to the community that he can do whatever he wants, and disregard the damage he's doing.' Harrison himself has never given interviews. Photos of him are scarce. He has no social media presence, no public charity work, and surfaces only in the occasional corporate press release.  He is, in the words of those who have tried to find him, a digital ghost.  Shirley Romero Otero, 70, who has been fighting for her ancestral rights for five decades The barbed wire fence erected by William Bruce Harrison, the reclusive Texas oil billionaire who has angered locals with his land hogging A staff member confirmed with the Daily Mail that he was at his ranch this week for meetings, but declined to answer any questions about his elusive boss.  Born in August 1986, Harrison was just 17 when his father, Bruce Harrison, died in a tractor accident on the family's Texas ranch. As an only child, he became the sole heir to the multigenerational Dan Harrison oil fortune – an empire built by his grandfather that stretches back over a century of Texas crude. Even that windfall proved complicated. Harrison only wrested full control of his inheritance after winning a bitter legal battle against his own uncle in 2017. With his fortune finally secured, he moved fast. That same year, he purchased Cielo Vista Ranch for a reported $105million, making it one of the largest ranch sales in American history. The property spans more than 20 miles of the rugged Sangre de Cristo mountain range, including the 14,047ft Culebra Peak, and is said to be the tallest privately-owned mountain on earth. Harrison charges hikers $150 a head to climb it. Bernadette Lucero, another La Sierra Environmental Guardians Committee member, said she did not understand the billionaire on the other side of the barbed wire.  'He's blown millions of dollars on this fence and trying to build a megamansion up there – and he only comes to the ranch twice a year,' Lucero told the Daily Mail.  'He was raised with a silver spoon. I just have no idea what motivates him.'   Construction on the fence began in 2021 and immediately enraged locals, who watched bulldozers cut a 20ft gash along the mountainside and disrupt centuries-old irrigation channels.  These community water ditches are the lifeblood of farming families in one of Colorado's driest and poorest counties – nearly a third of Costilla County residents live below the federal poverty line. Locals have long feared that the fence disrupted water flows, risked chemical contamination from disturbed underground aquifers, and blocked the migration of elk, mule deer and other wildlife across 80,000 acres of terrain. William Bruce Harrison purchased Cielo Vista Ranch near San Luis, Colorado, for a reported $105million, making it one of the largest ranch sales in American history Harrison, second from right, at a meeting of his investment firm  The mountain range includes the Culebra Peak, said to be the tallest privately-owned mountain on earth Frank Vigil, one of the locals who was given keys to access the Cielo Vista Ranch near San Luis, Colorado A jointly commissioned 83-page wildlife report – produced by consultants hired by both Harrison's team and Costilla County officials – confirmed those fears this month.  The fence, the report found, is a threat to elk and mule deer by blocking movement to food, water and safe habitat. The property may also be home to several threatened and endangered species, including Canada lynx, American marten and snowshoe hare. And about a third of Cielo Vista is already protected under a conservation easement for elk habitat. The report warned that, when interrupted, animals grow too weak to find alternative routes and die along the fence line. It noted that pregnant animals forced to navigate the barrier in spring may miscarry, causing long-term population decline. It further cautioned that the fence could trap animals during wildfires and have devastating results. Even Harrison's 29 so-called 'wildlife jumps' – sections where the fence top is slightly lower – were found to be inadequate, sometimes separating calves and fawns from their mothers. The authors recommended hundreds of modifications, including lowering sections for animals to jump over, raising the bottom wire so smaller creatures can pass through and removing barbed wire throughout. In the most ecologically sensitive areas, they recommended tearing the fence down entirely. One local took particular issue with the fencing over hunting concerns.  Florentino Rael, 31, who grew up at the foot of the mountain and expressed concerns over access to hunting on property Harrison's $9million mansion in a private leafy enclave in Houston, Texas 'The first elk I ever shot, I shot him right out of my living room window,' Florentino Rael, 31, told the Daily Mail.  Rael expressed concern that Harrison's fences are restricting the movement of animals that local families have hunted for generations.  'I'll never have that experience ever again in my life,' Rael said, pinning blame on the fence. 'Essentially you're killing the culture that will never, never be alive again.'  Harrison's attorneys did not respond to the Daily Mail's requests for comment. His lead defense attorney, Jamie Cotter,  has said previously that critics of his fence have sought to 'dehumanize and demonize' a rich man. Those with access rights to the land are given keys to pass through the fence.  But those keyholders said that Harrison's security guards, cameras and drones make the land feel more like a prison complex.  Still, Harrison's neighbors have secured some minor wins against him. County commissioners voted to ban new high fences in September 2023. A preliminary injunction followed weeks later. State water quality officials cited Harrison's team for disrupting water flows without permits. Colorado Governor Jared Polis signed legislation in 2025 placing strict new restrictions on fences over 5ft tall in the Sangre de Cristo land grant area – a law widely seen as being aimed directly at Harrison. But none of it has brought the fence down. A sign hangs on a fence indicating that legal action will be taken against trespassers. A local group is fighting the installation of the 8ft fence around Harrison's sprawling Cielo Vista Ranch Bison graze along the Colorado property. Harrison's lawyers say he is motivated by conservation and that critics try to 'demonize' him  Harrison has since inflamed tensions further.  Ahead of a February 2026 hearing, Harrison filed plans for a sprawling high-altitude compound anchored by a 7,000sq ft home on the ranch. The development includes what planning documents describe as a 'toy box' building to house his personal helicopter, plus a fleet of snowmobiles and ATVs. Most provocatively, he has requested a 233-acre security buffer zone around the compound. Land-rights attorney Madeline Finlayson ridiculed the demand in court, telling the judge it represented more privacy than the pope and the president of the United States enjoy combined. Otero, who was a plaintiff in a landmark 2002 Colorado Supreme Court case that confirmed local families' access rights to the area in perpetuity, frames the whole saga as a class war being waged by a privileged outsider against an indigenous community with deep roots in the land. 'We are against one of the most powerful, richest, white men who thinks he can do that,' she said. Otero remains cautiously optimistic that the wildlife report will shift the legal tide – but she is under no illusions about Harrison's power. Rael is far less hopeful. He moved away from the area after a family dispute and now lives in Colorado Springs, three hours from the mountain he grew up on. When he looks back at his home, sees a community torn apart from within – younger generations leaving, older fighters dying off, and Harrison waiting them all out. 'The people are just going to give up, and the fence is just going to be the fence,' he said. 'It's a never-ending battle, and probably a losing battle at this point.'