Marc Joseph to assume role of Deputy Building Commissioner; Paul Williams to assume role of Assistant Housing Commissioner BOSTON – Wednesday, April 21, 2021 – Mayor Kim Janey today announced the appointment of Sean Lydon as the Interim Commissioner of the Inspectional Services Department (ISD). Marc Joseph will assume the role of Deputy Building Commissioner, and Paul Williams will assume the role of Assistant Housing Commissioner. ISD administers and enforces building, housing, health, sanitation and safety regulations mandated by city and state governments. Inspectional Services is made up of five regulatory divisions charged with serving the public by protecting the health, safety and environmental stability of Boston's business and residential communities.