With her distinctive plaited, blonde hair Tymoshenko was a key figure in Ukraine's 2004 Orange Revolution.
He blames Ms Tymoshenko for sacrificing the ideology of the 2004 orange revolution to political expediency and populism.
Growing out of that research, our latest book, The Orange Revolution, includes the results of a 350, 000-person study that measured the characteristics of extremely productive teams.
European leaders missed the chance presented by the orange revolution (though to be fair, Mr Yushchenko and other Ukrainian politicians botched their opportunities even more badly).
Tymoshenko, the heroine of the Orange Revolution that swept the country in 2004 and 2005, has been in prison since last October for alleged abuse of office.
Adrian Gostick and Chester Elton are the authors of the New York Times bestseller The Orange Revolution: How One Great Team Can Transform an Entire Organization (Free Press).
Following her sacking last year, over what was widely acknowledged as very poor management of the economy, Ms Tymoshenko has allied herself, varyingly, with forces opposed to her erstwhile Orange Revolution ally.
Tymoshenko, who was a leading figure in the 2004 Orange Revolution and had been on a 20-day hunger strike until last week, argues she has been victim of mistreatment and politically-motivated imprisonment driven by current president Viktor Yanukovych.
They are quick to point to successes in the past, such as Corazon Aquino's "People Power" in the Philippines, which ousted the corrupt regime of Ferdinand Marcos in 1986, or, more recently, the Orange Revolution in the Ukraine.
It is a bitter reversal for Tymoshenko since the Orange Revolution days, when she and her ally Viktor Yushchenko packed the streets of Ukraine in protest at a rigged election that went in favour of the pro-Russian Mr Yanukovych.
The problems between the billionaire and his candidate may help sway the election to Serhiy Tihipko (or Russian spelling, Sergiy Tigipko), ahead of both Yanukovych and one-time Orange Revolution darling and Forbes Power Woman Yulia Tymoshenko, who is also a candidate.
FORBES: Ukrainian Billionaire and His Presidential Candidate
Now she has managed to pull some of Mr Yushchenko's own supporters over to her side and form a new coalition that takes in the small party of Vladimir Litvin, who served as speaker before the orange revolution and has now got the job back again.
ECONOMIST: As Ukraine��s politicians bicker, the economy slides
Ms Tymoshenko's main rivalry is not with Mr Yanukovich at all, but rather with her erstwhile orange-revolution ally, President Viktor Yushchenko.
ECONOMIST: As Ukraine��s politicians bicker, the economy slides
The Alliance for Austria's Future, as the new party is called, has adopted the colour orange from Ukraine's revolution.
ECONOMIST: The far-right maverick forms a new party of his own
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