"This is especially problematic for a company that's in crisis. It's hard to see how any fundamental decision can be made," Yoffie said. "One would hope the board will re-evaluate what the appropriate leadership structure is, even on a interim basis."
The challenges are extraordinary. A blog post written by a former Uber engineer in February alleged a sexist workplace with dysfunctional management oversight, further catapulting the company's aggressive culture into the spotlight. Soon after, a video surfaced of Kalanick berating one of Uber's drivers, prompting him to publicly admit "I need leadership help." Former attorney general Eric Holder and the law firm Covington & Burling were brought in to do a comprehensive review, making 47 recommendations to overhaul Uber's culture - many of them consisting of basic management tactics - all of which the company's board has said it will adopt.
But that's only just the start of the company's rough year: Executives have been heading for the exits, a federal probe has been launched into Uber's use of a secret software program, and the company has been engaged in a legal battle with the self-driving car unit of Google's parent company, Alphabet, over alleged theft of intellectual property. Capping it all off was the sudden resignation Tuesday of billionaire board member David Bonderman, who cracked an "inappropriate" joke about how much women talk in the boardroom at an Uber event actually designed to spotlight the changes the company would be making to make its culture more inclusive.
"They're going to go nuts if they don't have a final arbiter," said Michael Useem, a professor at Wharton and director of the business school's Center for Leadership and Change Management. "It's like Management 101. ... Nothing runs without one person at the top. Nature abhors a power vacuum."
Asked about the lack of an interim leader, an Uber spokesman said in an emailed statement that "we have a strong leadership team including veterans who helped make the business what is today and new talent who are helping to drive the changes we're committed to making. The entire team is excited by the opportunities ahead of us."
In the Holder report, recommendations the board has said it will adopt include changes at the board level, such as adding independent members and an independent chair, as well as reallocating some of Kalanick's responsibilities and looking for a chief operating officer with experience rehabbing corporate cultures and a background in diversity and inclusion issues. Twelve executives will be running the company in Kalanick's absence - three who run the company's business in global regions, three product and engineering leaders, four officials on its legal, safety, policy and communications team, as well as its now high-profile human resources chief, former Google executive Liane Hornsey, and Frances Frei, a Harvard Business School professor it has hired to be "senior vice president of leadership and strategy."
In an interview with The Washington Post last week, Frei said "the candidates that we are considering and that want to be considered for this role are vast," referring to the chief operating officer search. And in response to questions about the company's leadership vacuum, Frei indicated the many open seats could have a hidden upside. "I'm not sure I would entirely choose it, but we have an opportunity that's rare. We can bring in a set of people as opposed to individuals," she said, hand-picked as a team who can work together well.
Still, management experts said the massive challenges that lie ahead for the company will be even more difficult because of the lack of a clear point person at the top. "This is a very odd situation, with twelve people in a committee running a company - that to me is a recipe for chaos," said Peter Crist, chairman of the executive search firm Crist Kolder Associates.
Bill George, a member of the board at Goldman Sachs who was a director when chief executive Lloyd Blankfein was undergoing treatment for cancer, said that given the circumstances, it was a good idea for Kalanick to take a leave of absence. "But the big surprise to me is they didn't appoint an interim chief executive," said George, the former chief executive of Medtronic who is also teaches at Harvard Business School. "The idea that the team's going to handle it and 'please call me on strategic situations' - if that's really what they're going to do, that's not a good idea."