Not serving on the US Department of State's Foreign Affairs Policy Board would be a good start. To be fair, Katherine Maher took that role after her time as Wikimedia CEO. But landing such a role implies one is well connected, and she interned at the CFR [1] before her time at Wikimedia. In other words, she seems far too well connected to the US government to be called "neutral".
In the words of the New York Times, "Journalists have no place on the playing fields of politics. Staff members are entitled to vote, but they must do nothing that might raise questions about their professional neutrality" - https://www.nytimes.com/editorial-standards/ethical-journali...
[1] The Council on Foreign Relations (CFR) is an American think tank specializing in U.S. foreign policy and international relations. [..] Its membership has included senior politicians, numerous secretaries of state, CIA directors, bankers, lawyers, professors, corporate directors and CEOs, and senior media figures. - https://en.wikipedia.org/wiki/Council_on_Foreign_Relations
In the words of the New York Times, "Journalists have no place on the playing fields of politics. Staff members are entitled to vote, but they must do nothing that might raise questions about their professional neutrality" - https://www.nytimes.com/editorial-standards/ethical-journali...
[1] The Council on Foreign Relations (CFR) is an American think tank specializing in U.S. foreign policy and international relations. [..] Its membership has included senior politicians, numerous secretaries of state, CIA directors, bankers, lawyers, professors, corporate directors and CEOs, and senior media figures. - https://en.wikipedia.org/wiki/Council_on_Foreign_Relations