Introduction to Indefinite Inner Product Spaces, Schur Analysis, and Differential Equations: A Volume Dedicated to Heinz Langer
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"This volume is a tribute to Heinz Langer on the occasion of his eightieth birthday. Two earlier OT volumes (namely, volume 106 and volume 163; see  and  respectively) were dedicated to Heinz, the first one on the occasion of his sixtieth birthday, and the second one on the occasion of his retirement...The first named editor (DA) worked very hard on Heinz’ papers (and in particular on the above-mentioned series of papers with M.G. Krein) during his doctoral studies  at the Weizmann Institute in Israel."
Analysis | Other Mathematics
D. Alpay and B. Kirstein. Indefinite inner product spaces, Schur analysis, and differential equations: A volume dedicated to Heinz Langer, volume 263 of Operator Theory: Advances and Applications. Basel: Birkhäuser, 2018.
In Daniel Alpay and Bernd Kirstein (Eds.), Indefinite Inner Product Spaces, Schur Analysis, and Differential Equations: A Volume Dedicated to Heinz Langer. Dr. Alpay's introduction begins on page vii (page 7 of the PDF).