Keynote Address at the 14th Biennial History of Astronomy Workshop at the University of Notre Dame, June 19-23, 2019

The Art of Astronomical Observations, Opening Address to the Art Exhibition “Night Watch” at the Natural History Museum in Vienna, April 9, 2019

Exactitude in the History of Science: A Brief Overview, Media of Exactitude in the Humanities, Arts, and Sciences, University of Basel, October 3-5, 2018

Making Invisible: The Other Side of Scientific Visualization, Colloquium Making Visible-Getting Visible: Three Conversations, at the KIT (Karlsruhe), June 14, 2018

Drawing the Nebulae in the Nineteenth Century: Points of Entry into the Wider Cosmos, Webb Deep Sky Society, Annual Meeting at the Institute of Astronomy, Cambridge University, June 2, 2018

The Astronomer’s Chair: The Moral Economy of Sitting, Colloquium for the History of Knowledge at the Chair for the History of Science, Humboldt University, Berlin, April 25, 2018

The Future of Astronomy's Archived Observations – An Open Discussion, Panel at the American Astronomical Society Meeting, Washington DC, January 08, 2018


The Astronomer's Chair: Moral Economy of Sitting in Science, 1750-1900, Tagung "Vom Schreibtisch", LMU, Munich, December 14-16, 2017


What Does Materiality Mean for the History of Photography: The Case of Astrophotography, Montagskolloquium, Deutschen Museums, Munich, December 11, 2017


Ornament and the Mind Sciences: A History of Lines, Flatness and Race, Kunsthistorische Objektwissenschaft, LMU, Munich, November 20, 2017


Reframing Photography for the History of Science, STS Seminar York University, Toronto, October 3, 2017


Things: Freedom in the Photo-Objects of Science, Eikones University of Basel, Basel, September 14, 2017


The Materiality of Photography, Vossius Center for History of Humanities and Sciences, Amsterdam, September 11, 2017


The Ornamental Mind, at the Oberseminar of the "Perspektiven der Wissenschaftsgeschichte" at the Chair for the History of Science, LMU, July 6, 2017


TBA, at the Cluster of Excellence »Image, Knowledge, Gestaltung« at Humboldt University zu Berlin, May 23, 2017


Spiral Nebulae, at in house-seminar of the Arcetri Observatory, Florence, Feb. 22, 2017


Handling the Heavens: The Photo-Objects of Astronomy, at Photo-Objects: Photographs as (Research Objects) at the Kunsthistorishes Institute in Florence (Italy), Feb. 16, 2017


Conception and Perception, 5th Young Researchers Days in Logic, Philosophy and History of Science, Royal Academy of Science, Brussels, Nov. 25-26, 2016


Varieties of the Act of Drawing in Astronomy, for conference: Anton Pannekoek (1873-1960): Ways of Viewing Science and Society, Royal Netherlands Academy of Arts and Sciences, Amsterdam, June 9-10, 2016


The Ornamental Mind: Ornament and the Mind Sciences, at the Chair for the History of Science, University of Regensburg, May 18, 2016


Drawing and Photography in the History of Astronomy at the National Maritime Museum (held at the Institute for Historical Research), November 24, 2015


Visual Studies Lecture 2014-2015 at the University of Pennsylvania, April 16, 2015


"Ornamental Mind" Seminar at the Visual Studies centre at the University of Pennsylvania, April 17, 2015


"Capturing Astronomical Objects in the 19th c” Research Seminar at the Ecole des Hautes Etudes en Sciences Sociales, Paris,
March 15, 2015


Book at Lunch: Observing by Hand with Martin Kemp, Stephen Johnston, and Chris Lintott, TORCH, Univeristy of Oxford,
February 24, 2015.


“Hybrid Images in the History of Science.” Workshop by Technical Image at the Humboldt University in Berlin, 19-21 February 2015.


“Photography is not alone: a mixed history of photographing the heavens.” Seminar at the Faculty of History, University of Oxford.
October 30, 2014.


 “Photography and Hybrid Images in the History of Science.” Seminar at the School of History, University of Kent, October 15, 2014.


“Doing things with Photography: Drawing Photographs of Nebulae.” Research Seminar at the Office for History of Science, Uppsala. September 16, 2014.


"On Kant’s Hands.” Workshop: Chirality in the Arts. University of Basel. June 12, 2014.


“Science is Fiction: the Films of Jean Painleve”, Roundtable discussion participant, New College, Oxford University, May 13, 2014.


“Image and Trust in Science,” Guest Seminar, Trust in Science, University of St. Galen, December 10, 2013.


“Drawing Photographs: Celestial Objects on the Plate and on Paper.” Panel Session: Practicing Photography in the Sciences. 24th International Congress of History of Science, Technology and Medicine, Manchester, July 25, 2013.


“Visual Representation of the Nebulae in the 19th Century.” Colloquium Dialogo, Dept. for the History of Natural and Technical Sciences, Univ. Stuttgart, February 5th, 2013.


“Spirals Abound, Spirals Unfound: On Seeing and Not-Seeing Nebulae.” Wissenschaftliche Kontroversen, University of St. Gallen, September 28, 2012.


“Astrophotography and Hand Drawing: the case of John Herschel and his Skeletons.” Kunsthistorisches Institut der Universität zu Köln, June 15, 2012.


“John Herschel’s Skeletons.” Forschungskolloquium zur Wissenschaftsgeschichte, TU-Berlin, May 30, 2012.


“Constructional Observations: Marey and Herschel.” University of Lucerne, Cluster Meeting, February 17, 2012.


“The Role of Sketching in the Observing Books of 19th-Century Nebular Researchers.” Royal Astronomical Society, London.
January 13, 2012.


“Procedures in Astronomers Observing Books: Notes and Sketches.” Histoire des sciences, Histoire du texte. Université Paris 7.
November 17, 2011.


“Introduction to Stablizing and Destablizing Images.” (with Thomas Brandstetter), Eikones Colloquium, Basel, September 22, 2011.


“Scribbling in Space.” Über Kritzeln. Literaturmuseum der Moderne, Marbach. June 6, 2011.


"Skeletons and Bodies.” Die Totale Erfassung der Welt zur Geschichte Fotografischer Messbilder. IFK, Vienna. May 27, 2011.


“Ludwig Fleck on Observation.” Eikones Colloquium, Basel, March 31, 2011.


“Astronomical Drawings and Tacit Knowledge.” Workshop at the IKKM Bauhaus University Weimar. December 15-16, 2010


“John Herschel’s ‘Working Skeletons’: A Look at the Procedures of Drawing Nebulae.” History of Science Society Meeting, Montreal,
November, 2010.


“Scientific Observation, Perception and Epistemology, c. 1850-1920.” Eikones, University of Basel, October 21, 2010.


“Philosophy and Architecture: The Utopia of Home-sickness.” Ethics and Architecture, KHI, Florence, July 2, 2010.


“Russell and the Philosopher-Psychologists: A Look at the Data of Sense.” Clermont, France, June 2, 2010.


“Tracing the Nebulous: Familiarization through Drawing.” KHI, Florence, November 10, 2009.


“Drawing a Spiral Nebula.” Showing, Making, at Filmmuseum, Amsterdam, June 18-19, 2009


“Data, Phenomena, and Non-Propositional Observational Records.” Canadian Society for the History and Philosophy of Science Conference, Carleton, Ottawa May 25-28, 2009.


“Scientific Observations and ‘Working Images’ – Drawing as a research tool for the Nebulous.” Yale University – Material Probe III, November 13-15, 2008.


“Observation and the Hand: Observing Books and 19th-century Nebular Research.” Presented at the History of Science Society Meeting in November 5, 2008.


“The 1850 Image of the Great Spiral (M51): A Biography of an Image.” Invisible Seminar, Pisa, Italy. Istituto e Museo di Storia della Scienza and Max Planck Institute for the History of Science, October 14-16, 2008.


“Procedure [Verfahren] in Victorian Astronomical Observing Books.” The Logic of Procedure at the Wissenschaftskolleg zu Berlin,
March 19, 2008.


“History of Stellar Astronomy and Nebular Research.” Presented at a retreat for the Max Planck Institute for Astronomy in Bad Münstereifel, Germany, March 11, 2008.


“Observations, Descriptions, and Drawings of Nebulae: A Sketch.” Presented as part of the Colloquium series in Department III of the Max Plank Institute for the History of Science. January 15, 2008.


“Constructing the Heavens: Nebulae in Victorian Science.” Presented at MaterialProbe II, Kunsthistorische Institut, Florence,
October 11-13, 2007.


“Explaining G.F. Stout’s Reaction to Russell’s ‘On Denoting’.” Presented at Conference at McMaster University, Celebrating the Centenary of ‘On Denoting’, May 14-18, 2005.


“Artistic Inscriptions and Philosophy.” Presented at the AMSS Conference in collaboration with the Political Science Department at the University of Toronto, April, 2005.


“Russell’s Notion of Philosophical Analysis and Edwardian Philosophy.” Varieties of Analysis, British Society for the History of Philosophy, at Oxford University, March 30– April 1, 2005.