Thornton Tomasetti, the international engineering firm, announces that it has entered into an agreement to acquire Swallow Acoustic Consultants Limited (SACL), a specialist in acoustics, noise and vibration control engineering based in Mississauga, Ontario, Canada. The addition of Swallow will bolster Thornton Tomasetti's Structural Engineering and Forensics practices as well as its Canadian presence. The deal is scheduled to close in early 2017. Terms of the transaction were not disclosed.