Four top executives at the University of Maryland Medical System have resigned amid investigations into accusations of self-dealing among the hospital network’s board members, the system announced Thursday. Those resigning are Megan Arthur, the system’s primary lawyer; Jerry Wollman, the chief administrative officer; Christine Bachrach, the system’s chief compliance officer; and Keith Persinger, the chief performance improvement officer. **SNIP** The resignations come as Nygren Consulting of Santa Barbara, Calif., works to finish its examination of deals worth millions of dollars that led UMMS CEO Robert Chrencik and Baltimore Mayor Catherine Pugh to resign from their jobs. The consulting firm was...