For more than six decades, Warren Buffett was not simply the chairman of Berkshire Hathaway.

He was Berkshire Hathaway.

The annual letters, the famous shareholder meetings in Omaha, the folksy investment lessons, the enormous portfolio of businesses and the company's reputation for patience and discipline were all inseparable from one person.

That era formally changed Friday.

Berkshire Hathaway announced that Buffett, now 96, has stepped down as chairman with immediate effect and has been named chairman emeritus. He will remain on Berkshire's board and continue to provide his judgment and perspective. His son, Howard Buffett, a Berkshire director since 1993, has become chairman.

The change is historic, but it is not a sudden break with the succession plan Berkshire has been preparing for over many years.

Greg Abel already took over as chief executive earlier this year, handling the operational and investment responsibilities that had previously been centered around Buffett. Howard's role is different.

He is not being installed as the company's day-to-day chief executive.

Instead, his significance lies in the part of Berkshire that is much harder to measure on a spreadsheet: its culture.

And that makes Howard Buffett's new job unusually important.

Berkshire Hathaway has become a massive conglomerate with businesses spanning insurance, railroads, energy, manufacturing, retail and numerous other industries.

Its financial scale is enormous.

But Buffett has repeatedly argued that Berkshire's real advantage is its decentralized culture.

Managers are given substantial independence.

The company generally emphasizes long-term ownership rather than short-term financial engineering.

Capital allocation is treated as a central discipline.

Berkshire's relationships with shareholders are built around the idea that owners and managers should think like partners.

That culture cannot simply be transferred through a legal document.

It has to be maintained through people.

Howard Buffett has long been identified as a guardian of that culture. Before taking the chair, he had already served on Berkshire's board for more than three decades. Buffett previously described the chairman role as one way to provide an additional layer of protection for Berkshire's culture during succession.

The distinction between Howard and Greg Abel is therefore crucial.

Abel runs Berkshire.

Howard helps oversee the environment in which Berkshire operates.

That division was part of Warren Buffett's long-discussed succession thinking.

That makes the transition more interesting.

Howard has not spent his career trying to become another Warren Buffett.

He has spent much of his professional life outside the traditional investment world, including work in agriculture and philanthropy.

His background is notably different from his father's.

That difference may actually be useful.

Berkshire does not need another Warren Buffett.

It needs a leadership structure that can preserve what worked without pretending the founder can be replaced.

Howard's appointment reflects that reality.

He is not being asked to replicate his father's investment career.

He is being asked to help protect the principles that became embedded in the company.

In earlier discussions about succession, Warren Buffett emphasized that Berkshire's culture ultimately depends on its board, managers and shareholders, not on a single individual. Howard's role was described as an additional safeguard rather than the sole mechanism protecting the company.

That distinction is now becoming reality.

Buffett handed operational control to Greg Abel earlier this year.

That was a major moment, but Friday's announcement is arguably even more symbolic.

The chief executive role controls the machinery of the company.

The chairmanship carries a different weight at Berkshire because the position has been associated with Buffett's oversight, capital-allocation philosophy and relationship with shareholders.

For decades, Berkshire's chair was Buffett.

Now it is his son.

That creates an extraordinary generational shift.

Yet the actual business is not suddenly being handed over to one person.

Abel remains CEO.

Howard is chairman.

Warren remains on the board as chairman emeritus.

The company is therefore entering its post-Buffett era through a three-part structure rather than a single replacement.

That point matters.

Berkshire said Buffett will continue as a director and continue to offer his judgment and perspective.

So Friday is not a total farewell.

There will still be Warren Buffett inside Berkshire's governance structure.

But the distinction between influence and formal authority is changing.

For the first time in more than 60 years, Warren Buffett is no longer Berkshire's chairman.

That means important decisions will increasingly be associated with the next generation of leadership.

The symbolic effect alone will be enormous.

The biggest question is not whether Berkshire has talented people.

It clearly does.

The larger question is how the organization behaves when Warren Buffett is no longer the ultimate reference point.

Buffett's investing style was built around patience.

He famously preferred businesses with durable economics, trusted management and strong cash generation.

But the investment environment facing Abel is different.

Interest rates are higher than during much of Buffett's later career.

Technology companies have become enormous.

Artificial intelligence is changing corporate capital spending.

Private markets have expanded dramatically.

Berkshire itself is carrying a huge amount of liquidity that must eventually be deployed, returned to shareholders or retained for future opportunities.

Those decisions will now increasingly belong to the post-Buffett leadership team.

A chairman focused on culture can matter precisely because Berkshire's culture is built around restraint.

The company became famous for avoiding deals that did not meet its standards.

It was willing to wait.

It was willing to hold cash.

It was willing to walk away.

That discipline can become difficult to preserve when a company becomes as large as Berkshire.

There is always pressure to do something.

Buy a major company.

Launch a new strategy.

Change the capital-return policy.

Enter a hot industry.

Increase financial engineering.

The role of culture is partly to determine which pressures should be resisted.

Howard Buffett therefore enters the chairmanship at a point when Berkshire has an enormous range of possible choices.

His challenge is not necessarily to invent the next Berkshire.

It is to help ensure that Berkshire remains recognizable as Berkshire.

Succession in public companies often centers on executives, boards and shareholders.

At Berkshire, family has always been part of the broader story.

Warren Buffett has spoken for years about his children and their roles in philanthropy and company governance.

Howard's appointment now brings one of his sons into the highest board-level position.

Yet this is not a case of a family member taking over the CEO role.

Abel remains the operating leader.

That separation appears designed to preserve professional management while maintaining a family connection to the company's culture and long-term identity.

That may be the real story.

Buffett's greatest corporate challenge was never simply building wealth.

It was building a company that could continue operating when he was gone.

Friday's announcement is therefore the culmination of a succession project that began long before the world was ready to say goodbye to the old Berkshire.

The company has already transferred operational leadership.

Now it has transferred the chairmanship.

The founder remains close enough to advise.

But formal authority has moved.

And that means Berkshire is finally entering the era everyone knew was coming.

The important test will not be whether Howard Buffett can imitate Warren Buffett.

It will be whether Berkshire can preserve its identity without him at the center.

For Howard, that makes the new job deeply unusual.

He has inherited one of the most recognizable names in global business.

He has also inherited the responsibility of helping protect a culture that was built over generations.

Warren Buffett spent more than 60 years proving that Berkshire could outlast market cycles.

Now his son has a different task:

help prove that Berkshire can outlast Warren Buffett himself.