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My main activity is in number theory of integral positive ternary quadratic forms. This began through years of working with Irving Kaplansky. Much of his unpublished writing on quadratic forms can be found as pdfs at http://zakuski.math.utsa.edu/~kap/forms.html and about Lie and Jordan superalgebras at http://zakuski.math.utsa.edu/~kap/superalgebra.html One of my own email addresses can be found easily using the search feature at http://www.ams.org/cml and just putting in my last name Profile ©

The two excellent number theory books I keep recommending (for self study or help with the basics) are Weissman: An Illustrated Theory of Numbers. Lehman: Quadratic Number Theory: An Invitation to Algebraic Methods in the Higher Arithmetic. The web pages are Profile ©