INTRODUCTION :
​ For much of the past two decades I have presented a series of talks, principally on planetary geology, to the Ottawa Centre of the Royal Astronomical Society of Canada (RASC). Initially as Powerpoint presentations, more recently they have been live broadcast, recorded and posted on the web by RASC Ottawa's very own videographer, the late Eric Kujala. I have also made presentations in the context of the Ottawa Astronomy Workshop Series (OAWS), co-organised with Jim Thompson and Rob Lavoie.

​My presentations and commentaries seek to bring a professional - and constructively critical - geological perspective to bear on the publicly available data and interpretations made by the national space agencies and their associated university colleagues.

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