- 1951 – 1956
- Exhibitions in Indiana, Kentucky, Missouri and New York (as stated in 1956)
- 1956
- Solo exhibition, Art Studio of Aberdeen Proving Ground, Maryland, April 22 to May 6: wood and wire sculpture, mobiles, oil painting, jewelry, pottery, weaving (Baltimore Afro-American and Baltimore Sun, April 28, 1956)
- 1968
- First known German newspaper report (August 20); according to it, his works had never been publicly exhibited in Germany until then
- before 1978
- Group exhibitions in Pommersfelden (Weißenstein Palace) and Bad Neustadt an der Saale (his own exhibition list); according to a family note, all the works he showed in Pommersfelden were sold
- between 1976 and 1985
- Exhibition at the “Haus des Gastes,” Hofheim: paintings, jewelry and wood sculpture on a single evening (newspaper report “Ronald E. Johnson ein vielfältiger Künstler”)
- 1998
- 11th Unterfränkische Kulturtage, Schüttbau Rügheim (Hofheim), July 18 to 26: six artists from the Haßberge district, among them herman de vries, Petro Schiller, Ludwig Heinrich, Gerhard Nerowski and Jannina Hector (Fränkischer Tag, July 15, 1998)
- 2000
- Annual exhibition of BBK Unterfranken, Otto-Richter-Kunsthalle, Würzburg, through December 23: a focus marking his 70th birthday, with wood sculptures in linden and mahogany, canvases and reverse glass paintings
- 2002
- Galerie Kirchner, Grünsfeld, April 12 to May 12: sculptures, paintings and prints
- 2003
- “Licht-Signale,” Glashalle Maininsel, Schweinfurt
- 2003
- “Wald und Kunst,” Jägerhäuschen in the forest between Zeil and Bischofsheim, Forstdirektion Eltmann (July; Main-Post, July 4 and 11, 2003)
- 2003
- 12. Fürther Kunst-Begegnungen, Stadtmuseum Fürth, Schloss Burgfarrnbach, July 27 to September 14
- 2003
- “Bilder und Skulpturen,” Galerie Schulgasse 18, Eibelstadt, September 12 to October 3
- 2004
- Part of the photo project “Atelierspuren” by Marion Braun
- 2004
- “Zammete,” Markthalle Ostheim vor der Rhön, July 24 to August 8, opening of the 17th Unterfränkische Kulturtage
- 2005
- Sculpture symposium at the Froschgraben, Tauberbischofsheim, July: the jury chose his sandstone figure for purchase by the town; it stands in the Stadtgraben
- 2006
- BBK sculpture symposium “Zuruf,” forecourt of the Kulturspeicher Würzburg, July 13 to 22
- 2006
- art club Kunstverein Burgwedel/Isernhagen, Großburgwedel near Hanover: opening of the association’s new art space on November 5, together with the Würzburg painter Michael Kraus (Nordhannoversche Zeitung, November 2, 2006)
- 2007
- Joint exhibition with Carlo Catoni, Bad Kissingen
- 2007
- 1st Lichtenburg Symposium “Weite – Nähe,” Ostheim vor der Rhön, September 2 to 8, with Jan Polacek, Dierk Berthel, Ortrud Sturm, Steff Bauer and Sören Ernst; the sculptures were afterwards placed on the Tanzberg
- 2007 – 2008
- “Ronald E. Johnson – Bilder & Skulpturen,” Werkstatt Galerie Nordheim am Main, December 8, 2007, to the end of February 2008, introduced by Katharina Winterhalter
- 2008
- Kreisgalerie Mellrichstadt: the six poplar-wood sculptures from the Lichtenburg Symposium in the gallery garden (summer; Main-Post, May 16, 2008)
- 2008
- Catalogue “Ronald Johnson,” January 2008: text by Katharina Winterhalter, photographs by Dierk Berthel
- 2009
- “50 + XXL,” state exhibition of BBK Bayern, Balanstraße 73, Munich, March 8 to April 5
- 2010
- “Aus einer Hand” (From One Hand), retrospective for his 80th birthday, Kunstverein Tauberbischofsheim, Engel-Saal: paintings and small-format sculptures, September 25 to October 17, opening on September 24
- 2010
- Retrospective for his 80th birthday, BBK gallery in the Kulturspeicher Würzburg, October 29 to November 21
- 2011
- “Ronald Johnson – Malerei,” WeinGalerie, Neue Gasse, Schweinfurt, April to June 18
- 2024
- “Farbe trifft Holz,” Kunstverein Fulda, May 1 to June 16 (posthumous, with Ines Britz and Jan Döhrer)
- Year unknown
- Exhibition at ZF Sachs, Schweinfurt (before 2010)
- Year unknown
- Extensive solo show at the Künstlerhaus Würzburg, then at Turmgasse 9, through February 4 (two newspaper reports)