Mr Silk will be joined by new ACSI deputy president Antony Thow, who is the chief operating officer at industry fund LUCRF.
Both appointments will be effective in August 2017. Both men are currently directors of ACSI.
Mr Silk and Mr Thow will replace current ACSI president Gerard Noonan (of Media Super) and Trish Donohue (of Cbus).
Commenting on the appointments, ACSI chief executive Louise Davidson said, "We are delighted to have Ian and Antony take on these key roles for ACSI. Both of them have demonstrated a strong commitment to the work we do in seeking to improve the environmental, social and governance performance of listed companies.
"I also thank outgoing officeholders, Gerard Noonan and Trish Donohue. Both have played a very significant role in ACSI’s development."
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