A prominent business developer has been arrested after a domestic incident in Eau Claire.  Investigators say John Mogensen is accused of becoming angry at a woman last Friday, grabbing her by the neck and taking her cell phone.  The woman called police after the incident, saying she felt threatened and was scared he would do her harm.  Her name hasn’t been released.  Mogensen was arrested Saturday on charges of domestic disorderly conduct and obstructing an officer when he turned himself in.