Reports have revealed that Knapp would receive at least $66,000 (£40,000) in consulting fees on top of a $2.1m severance package from NTL, which operates in the UK, but is listed in the US.
Knapp is being paid $6,000 a day for consulting work at NTL, the FT reported.
The need for a study of executive pay was highlighted by the head of its compensation committee, Jeffrey Benjamin, who said such a study must be undertaken before an employment contract with Simon Duffy, the newly-appointed chief executive can be agreed.
Duffy is currently being paid £385,000 a year based on his contract agreed to when he was hired as chief operating officer.
Mark McMullen joins the private client services team from Smith & Williamson
Merger between Clear & Lane Chartered Accountants and Magma Chartered Accountants was finalised on 3 February
BDO has taken its new partner intake to 23 during the first half of its financial year, including the appointment of five partners in five weeks
The firm reports 7.6% global fee income growth for the year ending 31 December 2016