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Dr TC O'Neil

a photo of me at the bar wotever cabaret held in the royal vauxhall tavern in august 2021

Profile summary

Web links

Professional biography

I have worked at The Open University since 1999, intially as a lecturer in analysis and, since 2007, as a senior lecturer in analysis.

From 2010 to 2014 I was Head of the (then) Department of Mathematics and Statistics.

My name is TC (TeeCee), I'm non-binary and I use they/them pronouns.


Research interests

I'm a real analyst with a particular interest in geometric measure theory and fractals.

Teaching interests

I am deputy module chair of the third level pure mathematics module, M303, Further Pure Mathematics.

Research groups

NameTypeParent Unit
Pure Maths: Analysis & Geometry Research GroupGroupFaculty of Mathematics, Computing and Technology


Measuring Anisotropy in Planar Sets (2018-06-30)
O'Neil, Toby C.
Real Analysis Exchange, 43(1) (pp. 51-56)

Points of middle density in the real line (2012)
Csörnyei, Marianna; Grahl, Jack and O'Neil, Toby C.
Real Analysis Exchange, 37(2) (pp. 243-248)

Universal singular sets in the calculus of variations (2008-12)
Csörnyei, Marianna; Kirchheim, Bernd; O'Neil, Toby; Preiss, David and Winter, Steffen
Archive for Rational Mechanics and Analysis, 190(3) (pp. 371-424)

The Hausdorff dimension of the visible sets of planar continua (2007-11)
O'Neil, Toby
Transactions of the American Mathematical Society, 359(11) (pp. 5141-5170)

The Dimension of visible sets (2004-06)
O'Neil, Toby
Real Analysis Exchange, 30(1) (p 412)

Visible parts and dimensions (2003-05)
Järvenpää, Esa; Järvenpää, Maarit; MacManus, Paul and O'Neil, Toby C.
Nonlinearity, 16(3) (pp. 803-818)

The composition of two derivatives has a fixed point (2001-02)
Csörnyei, Marianna; O'Neil, Toby and Preiss, David
Real Analysis Exchange, 26(2) (pp. 749-760)

N-fold sums of Cantor sets (2000)
Hare, Kathryn and O'Neil, Toby
Mathematika, 47(1-2) (pp. 243-250)