• by Gavin O'Malley  @mp_gavin, January 13, 2010

AOL's revolving door was spinning faster than usual on Wednesday amid news that Shashi Seth -- its SVP of global ad products for just 90 days -- was leaving the company for Yahoo.

"While Shashi was only with us for 90 days, we appreciate the early steps he took to help us redefine AOL's advertising product roadmap," Jeff Levick, president of global advertising and strategy at AOL, said in a letter to employees on Wednesday.

In his own letter released Wednesday, Seth attributed his decision to personal issues, which "have made it impossible for me to maintain an executive role that requires extensive travel." Going into great detail, Seth continued: "Over the last 3 months, my relationship with my wife has been impacted severely, and the last 2 months have been very difficult for me as I saw my family unravel in front of my eyes."

Jamie Fellows has been named interim head of AOL's global ad products group, while the company searches for a permanent replacement.

Prior to AOL, Seth served as chief revenue officer at Web video start-up Cooliris, and, before that, head of monetization at Google's YouTube. Neither Seth or Levick said what Seth would be doing at Yahoo.

"Last week I was approached by a Bay Area company about an interesting role, discussions progressed very quickly, and I've accepted their offer to join," Seth said in his letter. "This new role will enable me to remain local, and gives me lots of flexibility in where I work from (we might move to India for some time) and be available for my family, yet gives me something interesting and challenging to work on."

AOL this week is in the process of issuing pink slips to about 1,400 employees, just weeks after about 1,100 of their peers "volunteered" to leave the company as part of AOL's "Voluntary Separation Program."

Exceeding the most aggressive estimates, AOL CEO Tim Armstrong told employees in November that he was looking for "up to 2,500 volunteers" to quit or commit to early retirement.

For the record, tenure of just three months doesn't break any records at AOL. Last April, incoming CEO Tim Armstrong ousted Greg Coleman as head of AOL's Platform A division after just three months on the job.

Coleman was brought onboard by former AOL CEO Randy Falco in early 2009 -- replacing Lynda Clarizio. Falco, however, was fired just two weeks after Coleman joined the company.

Coleman was in fact replaced by Levick, a former Google sales executive, who sources said had a close relationship with Armstrong while both were working at the search giant.