This commentary on the Psalms by Ernst Wilhelm Hengstenberg, a 19th century German Lutheran theologian and exegete, is still widely known and cited and is considered a solid addition to the personal library of any serious student of the Old Testament.
Hengstenberg is cited hundreds of times in works such as Pulpit Commentary and Keil & Delitzsch Commentary on the OT. The translator and editor of Calvin's Commentaries also makes frequent reference to the works of this 19th century German Protestant commentator.
According to the 1911 Encyclopædia Britannica, Hengstenberg's theses were "remarkable for their evangelical fervour and for their emphatic protest against every form of 'rationalism,' especially in questions of Old Testament criticism." Hengstenberg and some of his contemporaries were influential in promoting an approach that reads New Testament Christology back into the Old Testament, calling attention to the messianic prophecies and "types of Christ" (Adam, Jonah, etc.) that can be found there.