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) -- As evidenced by his

headline-grabbing appearance




recent courtroom battle with



, Larry Ellison never misses an opportunity to publicly trash the opposition.

The fiery Oracle boss has

verbally attacked



and its new CEO Leo Apotheker, who was previously in charge at SAP.

Larry Ellison, CEO of Oracle

Brash and belligerent, with a penchant for sportscars, planes and yachts,Ellison is undoubtedly one of the most colorful figures in Silicon Valley, as tech peers




IBM (HPQ) -- two of his past targets -- can attest.

The outspoken, hard-charging 66-year old is even the subject of a biography,

The Difference Between God and Larry Ellison


Nonetheless, Ellison is a divisive figure. Some experts have warned that his confrontational style may be

counter productive in the long-term

, but others say that this is key to both his own and his company's success.


rates Ellison as the sixth-richest person in the world with a fortune of $27 billion.

Jeffrey Pfeffer, a professor of organizational behavior at Stanford University and author of

Power: Why Some People Have It -- And Others Don't

, told


that Ellison's approach runs counter to current business thinking, which he describes as the "Kumbaya" theory of leadership.

"There is all this stuff about how you have to be nice and kind, but if you look, not just at Larry Ellison, but at a lot of other people, including some very successful politicians, you find that is not always the case," he said. "

Ellison is very blunt about what he is doing, and why he is doing it -- he does not have the veneer that a lot of people have."

Pfeffer points, in particular, to Oracle's battle to acquire PeopleSoft in 2004, which was fought tooth and nail by PeopleSoft chief Craig Conway. The CEO accused Oracle of attempting to disrupt PeopleSoft's business with its hostile takeover bid and was soon embroiled in a war of words with Ellison. At one point, the Oracle boss even included

Conway's dog in a now-famous barb

. The Oracle boss eventually

clinched the PeopleSoft deal.

Ellison even duked it out

with the European Union regulators last year over Oracle's controversial acquisition of


, railing against

an antitrust probe

that delayed the deal.

Ellison also shares some competitive traits with his close friend Steve Jobs at



, said Pfeffer. "I think that both

Ellison and Jobs are people who, like all successful people, are more interested in winning than whether people like what they have done," he said.

"Ellison is a consummate competitor," said Kaushik Roy, an analyst at Wedbush Morgan, in an email to


. "Whether it's selling software or racing yachts, it seems he's always looking for a good fight."

And Ellison always seems to pick fights he knows he'll win. "I would say that he's an aggressive realist," explained Stuart Williams, an analyst at TBR. "He's not afraid to commit business resources to an opportunity."

With limited growth in Oracle's core database business, Ellison was quick to see the potential of the applications market, said Williams. This saw Oracle spend almost $11 billion on PeopleSoft and retail specialist


in 2005. Three years later,

BEA Systems

was bought for $8.5 billion.

Despite his combative nature, Ellison delivers results. Oracle's stock has risen more than 123% in the last 5 years. Shares of arch-rivals IBM and HP have risen 65% and 45%, respectively, while



, whose CEO leadership has been questioned by many, has fallen more than 8%. Ellison, like his Apple counterpart, is also credited with turning his company's fortunes around, guiding Oracle out its near-catastrophic accounting problems in the early nineties.

Rebecca Wettemann, an analyst at Nucleus Research, describes Ellison's leadership style as measured and proactive, particularly around emerging technologies such as cloud computing. Ellison has noted that

Oracle's next big acquisition

will be a chip company, marking another stage in the company's metamorphosis.

"No one can argue with results -- Oracle has become one of the biggest and most profitable companies in the world," added Wedbush analyst Roy. "In the process, Ellison has made his share of enemies, but that has not necessarily given Oracle a combative corporate culture. Most employees of Oracle that I know are not as combative as Ellison is perceived to be."

As is the way, Oracle's battles continue. The database giant is

suing Google (GOOG)

for alleged patent and copyright infringement related to the Android operating system. And Oracle has made great play recently of its attempts to

subpoena HP's Apotheker,

who Oracle has said is purposely staying away from HP's northern California headquarters -- outside the court's jurisdiction.

(Incidentally, Apotheker told


Monday that he was physically at HP's headquarters in Palo Alto, moderating the company's fourth-quarter earnings conference calls.)

Charles King, president of Pund-IT research, acknowledges that Ellison has enjoyed great success, but says that this may have gone to his head. "Ellison may simply be too wealthy and powerful (and hold too many Oracle shares) for anyone to rein him in," he explained, adding that his belligerence could be extremely damaging Oracle's long-standing partnership with HP.

Not everyone, though, agrees that Ellison needs to tone it down. "When you meet Larry Ellison, he's a very shrewd, but still outspoken, businessman," said TBR's Williams. "He knows what he has to do, day-to-day, to run his business."

Brad Zelnick, an analyst at Macquarie Securities, adds that Ellison's aggressive approach has helped Oracle bridge competitive gaps in its products. "This has culminated in a truly competitive portfolio today -- both by acquisition


organic development and integration."

Larry Ellison has not yet responded to


request for comment on this article.

--Written by James Rogers in New York.

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