Day & Zimmermann, a provider of construction, engineering, staffing and defense solutions, said Joe Ritzel will retire from his role as chief financial officer effective April 1. Ritzel has spent 40 years with the company, serving as the second CFO in over 50 years. Ritzel joined D&Z in 1983 as a controller for its systems engineering subsidiary after leaving Deloitte. Over the years, he worked his way up to become vice president and treasurer, VP and group controller and eventually CFO in 2001. As CFO, Ritzel played a key role in the growth of the company, leading many important technology improvements, joint venture, merger and acquisition structuring and negotiations. In addition to his contributions to D&Z, Ritzel has been an advocate for people with disabilities. He is retiring as the executive sponsor of the Abled and DisAbled Advocates Partnering Together Employee Resource Group and has served on the boards of three nonprofits: Pride Ventures, Special Olympics New Jersey and the Kingsway Learning Center. Kathleen King, VP of corporate development, will succeed Ritzel as CFO, effective April 1.