On behalf of my late husband, David Liu, I would like to convey his sincere gratitude and respect for all the coauthors who helped, directly or indirectly, currently or in the past, in this product's development. With your help, he accomplished his goal: a comprehensive, authoritative, and current reference. The valuable expertise, strong support, and dedication of all the coauthors will make the Environmental Engineers' Handbook an unqualified success.

Special appreciation is extended to Bela Liptak and Paul Bouis, who did the final technical review of manuscript, art and page proofs, sharing their valuable time and advice to complete David's work.

Irene Liu

Princeton, New Jersey

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