The CIO of Philadelphia left the city to join a consulting firm that had previously provided services to the city and the Wireless Philadelphia project: Those consulting jobs were long over when Neff took the job, but ethics concerned were raised about past and future business. Neff had pledged, as is required, to not solicit business from Phila. for some period following her departure; she'll be heading up Civitium's international work, in any case.
KYW in Philadelphia reports that the ethics board found no violations because the consulting firm had no active contracts at the time Neff took the job. However, they suggested she should have consulted the board in advance to receive an all-clear before taking the job. KYW reports Neff's written response as stating that given there was no requirement to consult the board first, there's no reason to complain that she didn't.