She left in January 2005, citing disagreements with the management.
Lucas cited disagreements with faculty as the reason for her resignation.
Peddle cited disagreement between authorities as a major factor in his decision to sell the company.
The announcement Friday of his retirement cited disagreements over pace, strategy and progress.
In January 2011, she stepped down as President, citing disagreements with the organization's leadership.
Haqqani cited disagreements over attacks on civilians as reason for the split.
They cited disagreements over how the money would be spent and an insistence by some lawmakers on a veto power over specific land purchases.
He resigned citing disagreements with the organisation's chairwoman and founder, on the issue of neutrality.
Ms. Harris helped start Ms. magazine in late 1971, but she left after the first issue, citing disagreement on a wide range of issues.
Dr. Thornburg cited numerous disagreements that were put to faculty votes, all of which went overwhelmingly against the administration.