Michael Theobald is a German academic who published rather extensively on the Pastorals in his later career. To my knowledge, however, all of his work on the letters is in German (save for the just-published entry on Titus in The Paulist Bible Commentary), and so English-speaking students of the Pastorals may not be as familiar with his scholarship.
The single monograph Theobald produced on the Pastorals was published in 2016: Israel-Vergessenheit in den Pastoralbriefen: Ein neuer Vorschlag zu ihrer historisch-theologischen Verortung im 2. Jahrhundert. n. Chr. unter besonderer Berücksichtigung der Ignatius-Briefe [Forgetting Israel in the Pastoral Letters: A New Proposal for Their Historical-Theological Location in the 2nd Century A.D. with Special Consideration of the Ignatius Letters]. In this work, he examines the origination of the Pastorals through the lens of the topic of Israel. He is particularly concerned to compare the engagement with Israel in Romans (another book in which he specializes) over against what he finds to be a lack of engagement with Israel in the Pastorals. He ends up dating the letters to c. 140 AD.
Jonathan Lookadoo has served English-speaking students of the Pastorals well by reviewing Theobald’s monograph for RBL, and has graciously agreed to upload the review to Academia, allowing general access. In his review, he notes Theobald’s valuable highlighting of connections between Romans and the Pastorals, and appreciates the case Theobald makes for reading Titus as the first of the Pastorals. Lookadoo notes, “Those who argue for authentically Pauline Pastoral Epistles or for another first-century date will likely take issue with some of Theobald’s arguments, but this does not take away from the value of his study. “