Members of the Rockefeller family want the chairman and chief executive positions at Exxon Mobil to be separated, reports The Dallas Morning News.

Family members heavily involved in foundations and nonprofit groups — including those founded with Rockefeller money — will hold a press conference on Wednesday to explain the motivations for the request, which comes in advance of a May 28 shareholder resolution to split the head position.

The Rockefellers, while no longer among the company’s top shareholders, founded Exxon’s predecessor, Standard Oil. Neva Rockefeller Goodwin, great-granddaughter of John D. Rockefeller, sponsored a resolution this year that asks Exxon’s board to examine the effects of climate change and consider developing sustainable technologies.

Exxon’s board has recommended that shareholders vote no on both resolutions.

Speaking at the press conference tomorrow, according to a press release distributed Monday, will be Ms. Goodwin, as well as Peter O’Neill, a Rockefeller heir and businessman active in many nonprofit organizations, and Stephen B. Heintz, president of the Rockefeller Brothers Fund.