West, who earlier this year said he was giving up his drive for tenure at Harvard Divinity School to rejoin the faculty at Union Theological Seminary, posted what he called "my candid letter of resignation" to Twitter late Monday.
In it, he writes that the "disarray of a scattered curriculum, the disenchantment of talented yet deferential faculty, and the disorientation of precious students loom large" at Harvard.
The 68-year-old scholar suggests in the letter that politics were a factor in Harvard's decision not to extend tenure to him, citing his outspoken support for the Palestinian cause.
"We all knew the mendacious reasons given had nothing to do with academic standards. ... I knew my academic achievements and student teaching meant far less than their political prejudices," West says of the Harvard administration.