For more than five decades Bertram Kostant has been one of the major architects of modern Lie theory. Virtually all his papers are pioneering with deep consequences, many giving rise to whole new fields of activities. His interests span a tremendous range of Lie theory, from differential geometry to representation theory, abstract algebra, and mathematical physics. Some specific topics cover algebraic groups and invariant theory, the geometry of homogeneous spaces, representation theory, geometric quantization and symplectic geometry, Lie algebra cohomology, Hamiltonian mechanics, modular forms, Whittaker theory, Toda lattice, and much more. It is striking to note that Lie theory (and symmetry in general) now occupies an ever increasing larger role in mathematics than it did in the fifties.

Kostant is an architect of modern Lie theory and his mathematics interests span a huge range

Preface.- Acknowledgements.- The Capelli Identity, Tube Domains, and the Generalized Laplace Transform (With Sahi, S.).- The Variety of all Invariant Symplectic Structures on a Homogeneous Space and Normalizers of Isotropy Subgroups (with Brylinski, R.).- A Geometric Realization of Minimal t-type of Harish-Chandra Modules for Complex S.S. Groups (with Kumar, S.).- Nilpotent Orbits, Normality, and Hamiltonian Group Actions (with Brylinski, R.).- The Vanishing of Scalar Curvature on 6 Manifolds, Einstein's Equation, and Representation Theory.- Jordan Algebras and Capelli Identities (with Sahi, S.).- Nilpotent Orbits, Normality, and Hamiltonian Group Actions (with Brylinski, R.).- Minimal Representations of E6, E7, and E8 and the Generalized Capelli identity (with Brylinski, R.).- Groups and the Buckyball (with Chung, F.R.K. and Sternberg, S.).- Differential Operators on Conical Lagrangian Manifolds (with Brylinski, R.).- Minimal Representations, Geometric Quantization, and Unitarity (with Brylinski, R.).- Structure of the Truncated Icosahedron (such as Fullerene or Viral Coatings) and a 60-Element Conjugacy Class in PSl(2,11).- Immanant Inequalities and 0-Weight Spaces.- Lagrangian Models of Minimal Representations of E6 E7 and E8 (with R. Brylinski).- Structure of the Truncated Icosahedron (e.g., Fullerene or C60, viral coatings) and a 60-Element Conjugacy Class in PSl(2,11).- The Graph of the Truncated Icosahedron and the Last Letter of Galois.- Flag Manifold Quantum Cohomology, the Toda Lattice, and the Representation with Highest Weight ¿.- Clifford Algebra Analogue of the Hopf-Koszul-Samelson Theorem, the ¿-Decomposition, C(g)=End V¿¿C(P), and the g-Module Structure of ¿g.- Quantum Cohomology of the Flag Manifold as an Algebra of Rational Functions on a Unipotent Algebraic Group.- The Set of Abelian Ideals of a Borel Subalgebra, Cartan Decompositions, and Discrete Series Representations.- The Weyl Character Formula, the Half-Spin Representations, and Equal Rank Subgroups (with Gross, B., Ramond, P. and Sternberg, S.).- A Cubic Dirac Operator and the Emergence of Euler Number Multiplets of Representations for Equal Rank Subgroups.- On ¿g for a Semisimple Lie Algebra g, as an Equivariant Module over the Symmetric Algebra S(g).- A Generalization of the Bott-Borel-Weil Theorem and Euler Number Multiplets of Representations.- On Laguerre Polynomials, Bessel Functions, Hankel Transform and a Series in the Unitary Dual of the Simply-Connected Covering Group of Sl(2,R).- Comments on Papers in Volume IV.