Kornwasser, who holds a master's degree from Harvard Business School, previously was a senior executive at Medco Health, which he left in 2012 after it was acquired by Express Scripts.
Several months later, on Jan. 3, 2013, Valeant announced that it was hiring Kornwasser as executive vice president/company group chairman. Valeant chairman and CEO J. Michael Pearson said in the announcement that Kornwasser's "broad health care experience" in areas that include "understanding the retail and mail channels, will be invaluable to us."
A day before the press release was issued, on Jan. 2, 2013, Philidor Rx was incorporated in Delaware, according to that state's Division of Corporations.
Valeant's annual report in 2014 contains a copy of the letter detailing the conditions of Kornwasser's employment, which was dated the same day that Philidor incorporated. The letter notes that Kornwasser would report directly to Pearson.
The Jan. 2, 2013, letter says that Kornwasser will earn a base salary of $550,000 per year, and also says that Valeant will recommend to the talent and compensation committee of the company board of directors that he received equity awards valued at about $4.8 million.
Those equity awards included 85,000 stock options that each vest at 25 percent "one each of the 4 anniversaries following the date of grant," as well as 45,000 performance stock united which vest between zero and 300 percent based on meeting certain performance criteria "as measured approximately three years from the grant date.
The letter says that the grant date for the awards is the later of the dates of when Kornwasser started work at Valeant or the date that the talent committee approved the awards.
While at Valeant, Kornwasser oversaw, among other people, a manager named Gary Tanner. A spokeswoman for Valeant said Tanner "joined Valeant in December 2012," or a month or so before Philidor was incorporated and Kornwasser was hired by Valeant.
"Valeant's liaison with Philidor was ... Gary Tanner," the spokeswoman told CNBC in an email. "Gary interacted day-to-day with the Valeant dermatology team."
"Gary reported to Laizer Kornwasser, until Laizer ceased to be an employee of Valeant," she said.
Kornwasser did not leave to take an executive position at another drug company. Instead, Kornwasser joined two boards of directors.
One board was that of Everyday Health, a digital health and wellness company. The other was for Yeshiva University, the upper Manhattan college where Kornwasser obtained his bachelor's degree