Charles R. Geard, Ph.D.

Professor of Clinical Radiation Oncology, emeritus

Center for Radiological Research

Contact Information: 

Center for Radiological Research
630 West 168th Street
VC 11-205A/243
New York, NY 10032

Telephone: (212) 305-5662
Alternate: (914) 591-9244
Fax: 212 305-3229



BAgrSci, University of Melbourne, Melbourne, Australia, 1960
MSc. Botany, University of Tasmania, Hobart, Tasmania, Australia, 1969
PhD, Genetics, Australian National University, Canberra, Australia, 1973


Ponnaiya B, Amundson SA, Ghandhi SA, Smilenov LB, Geard CR, Buonanno M, Brenner DJ. Single-cell responses to ionizing radiation. Radiat Environ Biophys 2013 Nov;52(4):523-30. Epub 2013 Aug 31.

Hu B, Grabham P, Nie J, Balajee AS, Zhou H, Hei TK, Geard CR. Intrachromosomal changes and genomic instability in site-specific microbeam-irradiated and bystander human-hamster hybrid cells. Radiat Res 177, 25-34, 2012.

Su Y, Meador JA, Geard CR, Balajee AS. Analysis of ionizing radiation-induced DNA damage and repair in three-dimensional human skin model system. Exp Dermatol 19, e16-22, 2010.

Hu B, Shen B, Su Y, Geard CR, Balajee AS. Protein kinase C epsilon is involved in ionizing radiation induced bystander response in human cells. Int J Biochem Cell Biol 41, 2413-21, 2009.

Hei TK, Ballas LK, Brenner DJ, Geard CR. Advances in radiobiological studies using a microbeam. J Radiat Res (Tokyo) 50 Suppl A, A7-A12, 2009.

Bigelow AW, Geard CR, Randers-Pehrson G, Brenner DJ. Microbeam-integrated multiphoton imaging system. Rev Sci Instrum 79, 123707, 2008.

Hei TK, Zhou H, Ivanov VN, Hong M, Lieberman HB, Brenner DJ, Amundson SA, Geard CR. Mechanism of radiation-induced bystander effects: a unifying model. J Pharm Pharmacol 60, 943-50, 2008.

Meador JA, Zhao M, Su Y, Narayan G, Geard CR, Balajee AS. Histone H2AX is a critical factor for cellular protection against DNA alkylating agents. Oncogene 27, 5662-5671, 2008.

Baskar R, Balajee AS, Geard CR, Hande MP. Isoform-specific activation of protein kinase c in irradiated human fibroblasts and their bystander cells. Int J Biochem Cell Biol 40, 125-34, 2008.

Baskar R, Balajee AS and Geard CR. Effects of low and high LET radiations on bystander human lung fibroblast cell survival. Int J Radiat Biol 83, 551-9, 2007.