Kaiser management team still being formed by Gillespie. (Kaiser Foundation Health Plan of Texas; southwest division president Bill Gillespie)

NORTH DALLAS - Dr. Bill Gillespie's return to the Metroplex health care arena was relatively low key, but all eyes are focused on what he'll accomplish at Kaiser Foundation Health Plan of Texas.

Although it is the longest-operating health maintenance organization in the market, Kaiser has been challenged by growing competition as well as changing demands from consumers and large employers who pay for workers' care.

That's spelled market-share erosion, financial losses and leadership changes locally for Kaiser in recent years. As part of a national restructuring, the not-for-profit has altered its management levels. Company executives said they hope the move will allow Kaiser to expand …