Major changes are underway at the state Medical Examining Board, in an attempt to reduce long delays in disciplining doctors. The state legislature recently expanded the board from 15 to 21 members to be able to hold hearings more quickly when complaints are filed against doctors. Two board members are now involved earlier in investigations, and physicians now must respond to investigations earlier in the process, said William Gerrish, spokesman for the state Department of Public Health (DPH). Also, the DPH plans to hire a consultant by the fall to conduct a full review of the way complaints against doctors are investigated and adjudicated, Gerrish said. Most visibly, Gov. Dannel P. Malloy has also installed a new chairperson on the board, replacing Anne C. Doremus, a Manchester Republican, with Kathryn Emmett, a prominent Democrat and lawyer in Stamford who worked on Malloy’s transition team in 2010.