Who, What, Where

Terry Zysk and Mary Modahl have joined Health Dialog Services Corp., a Boston-based provider of health support services that is expanding its senior leadership team. Zysk has been appointed chief technology officer, and Modahl holds the position of senior vice president of marketing. Zysk joins Health Dialog from Sentillion, an Andover-based developer of identity and access management software for the healthcare industry. Most recently, Modahl was an independent consultant. From 1987 to 2001, she was with Forrester Research of Cambridge.

Greg Clark (left) has joined the Westin Boston Waterfront as the new director of sales and marketing. Clark joins the Westin Boston Waterfront team from the Boston Park Plaza Hotel & Towers, where he served six years as director of sales and marketing. In his new job at the Westin, Clark will oversee all sales, marketing, and advertising strategies for the property, manage the Westin Boston Waterfront sales team, and budget and forecast all sales goals.

Dennis H. Giesing has been appointed head of research and development at Cortria Corp. of Boston, a clinical-stage pharmaceutical company focused on developing medicines to fight cardiovascular disease. Giesing has more than 30 years of experience in drug development, and he was most recently at Aventis Pharmaceuticals, where he held worldwide responsibility for the Aventis R&D product pipeline.
(By Chris Reidy, Globe staff)