Mark Bitterman, the veteran lobbyist who in June left Orbital Sciences Corp. to work for rival rocket builder Space Exploration Technologies Corp. (SpaceX), has resigned from SpaceX.Bitterman, who formally joined SpaceX in mid-July as a senior vice president of government relations, resigned "for personal reasons — family obligations that require more time and attention than the demands of this job would allow," Xirstin Brost Grantham, a Washington-based spokeswoman for SpaceX, said Aug. 30. She added that "on an interim basis, the SpaceX Government Affairs team will be managed by Tim Hughes, SpaceX's general counsel."
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