Siobhan Wastie and Cerys Evans have both left the agency, it emerged this week. It is believed that neither has a new job lined up.
Wastie and Evans were both founding employees at HSD in 1998. Wastie joined the agency from Blackwell Healthcare PR where she was an account director. She headed up HSD's secretariat and symposia division.
Evans was responsible for heading up the agency's consumer healthcare division.
Neither Wastie nor Evans could be reached for comment as PRWeek went to press.
HSD founder and MD Lesley Scott said: 'I wish them both all the best for the future.'
Meanwhile, HSD has appointed its first head of events and conferences. Justine Haddon joins from her role as marketing manager at medical device company Molnlycke Health Care.
HSD account director Helena Symeou has also been promoted to head of medical comms and HR manager Anne Allum has become head of HR.
The agency has also appointed an account executive and two junior account executives.
PR and med ed agency HSD has clients in over-the-counter and prescription medicine, medical devices and complementary healthcare sectors, including Forest Labs, Galil, Bard and Molnlycke.