Dantes Diwiak studied singing with Klaus Kirchner and opera at the Musikhochschule Hannover with Theo Altmeyer. He took master classes with Hermann Reutter, Birgit Nilsson, Helmuth Rilling and Scot Weir. He was a member of the Staatsoper Hannover and the opera houses of Bremen and Oldenburg.
Diwiak sang the part of the Evangelist in Bach's Passions also in Moscow, France, Syria and Israel, among others. He has collaborated with the choir MarkusChor Hannover and the Staatsorchester in concerts and services. In 1982, he performed with them the Oratorio de Noël of Camille Saint-Saëns, in 1983 he participated in Rossinis Petite messe solennelle as part of the Kirchentag, also in Weber's Missa sancta No. 1 in E flat major. In 1989, he sang in Haydn's Die Schöpfung with the Harburger Kantorei in the St. Johanniskirche in Harburg, Hamburg. In the Neustädter Kirche, Hannover, he sang in choral concerts, in 1986 Stravinsky's Canticum sacrum, in 1988 Stravinsky's Cantata and Mozart's Great Mass in C minor, in 1990 Bach's Mass in B minor, in 1991 he was the Evangelist in the St Matthew Passion in the last concert conducted by Erhard Egidi, together with Anselm Richter, Monika Frimmer, Ralf Popken and Joachim Gebhardt. In 1994, a concert of the Mass in B minor in the Peterskirche in Heidelberg was recorded. Gerald Kegelmann conducted the Heidelberger Madrigalchor, the Accademia Filarmonica Köln and the Trumpet Consort Friedemann Immer, Veronika Winter, Kai Wessel and Raimund Nolte.
In 2007, Diwiak performed with the MarkusChor Hannover Haydn's Paukenmesse, Mozart's Krönungsmesse and Mendelssohn's Elias. With the choir Nordschleswigsche Musikvereinigung he performed among others in 2009 Haydn's Missa in angustiis and Bach's cantata Erschallet, ihr Lieder, erklinget, ihr Saiten! BWV 172.
In 2002, Diwiak founded together with Monika Frimmer, Christa Bonhoff and Peter Kooy a quartet Tanto Canto to sing rarely performed music a cappella, with piano or with ensemble. The quartet recorded in 2005 excerpts from the collections Augsburger Tafel-Confect (short for: Ohren-vergnügendes und Gemüth-ergötzendes Tafel-Confect, in English: Augsburg Table Confectionery, Pleasuring the Ears and Delightful to the Soul) of the composers Valentin Rathgeber and Johann Caspar Seyfert. In 2010, he appeared in a concert of the Universität Hamburg in the oratorio Die Glocke of Max Bruch. In November 2010, he was the tenor soloist in Verdi's Messa da Requiem in St. Martin, Idstein.
Dantes Diwiak is married to the contralto Christa Bonhoff.
- "Das Lied von der Glocke" (PDF) (in German). Universität Hamburg. 2010.
- "Dantes Diwiak (Tenor)". bach-cantatas.com. 2009. Retrieved 27 October 2010.
- "MarkusChor Chorwerke" (in German). MarkusChor Hannover. 2010. Retrieved 27 October 2010.
- Canticum sacrum / Ein Deutsches Requiem (in German). Neustädter Kirche. 16 November 1986.
- 30 Jahre Kantorei der Neustädter Hof- und Stadtkirche St. Johannis zu Hannover (in German). Neustädter Kirche. 20 November 1988.
- J.S. Bach H-MOLL-MESSE (in German). Neustädter Kirche. 27 May 1990.
- Passion unseres Herrn Jesu Christi nach dem Evangelisten Matthäus (in German). Neustädter Kirche. 10 March 1991.
- "Heidelberger Madrigalchor CDs" (in German). Heidelberger Madrigalchor. 2010. Retrieved 27 October 2010.
- "MarkusChor Veranstaltungen Konzerte" (in German). MarkusChor Hannover. 2010. Archived from the original on 19 July 2011. Retrieved 27 October 2010.
- "Aus der Zeitung" (in German). Nordschleswigsche Musikvereinigung. 2010. Retrieved 2 November 2010.
- "Rathgeber: Tafel-confect". arkivmusic.com. 2005. Retrieved 27 October 2010.
- "Rathgeber (1682-1750) Augsburgisches Tafel-Confect". musicweb-international.com. 2006. Retrieved 31 October 2010.
- Richard Hörnicke (16 November 2010). "Anspruchsvolle Aufgabe" (in German). Wiesbadener Tagblatt. Retrieved 16 November 2010.