PRESENTATIONS (1993-Present)

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1993 January Contractive zero divisors, Colloquium, Brown University, Providence, RI.
  February Contractive zero divisors, Colloquium, Uppsala University,
Uppsala, Sweden.
  March Contractive zero divisors, Colloquium, University of Linköpping, Sweden.
  April Invariant subspaces in Bergman spaces, Stockholm Analysis Seminar, Stockholm University.
  May The Riemann function and its applications, Analysis Seminar, Royal Institute of Technology, Stockholm Work of H.S. Shapiro, Conference in honor of the retirement of H.S. Shapiro, Royal Institute of Technology, Stockholm. First paper of I. Fredholm, Colloquium, University of Jyvaskyla, Finland.
1994 January The Reflection principle revisited, AMS winter meeting, Cincinnati, Special session on holomorphic differential equations.
  July Extremal problems in Bergman spaces, one hour invited lecture at the AMS Summer Conference on Bergman Spaces, Mount Holyoke, MA.
1995 January The Reflection principle revisited, Colloquium, University of Maryland, College Park, MD.
  February The Reflection principle revisited, Colloquium, University of Kentucky, Lexington, KY.
  March-May A short course on “Holomoprhic PDE and Potential Theory,” Universidad de La Laguna (Spain).
  June The Reflection principle revisited, two one-hour lectures, Universidad de Autonoma Barcelona, Spain.
1996 February-March The reflection of harmonic functions across real-analytic hypersurfaces, Northwestern University, Evanston, IL.
  September The isoperimetric inequality revisited, September 20, Trondheim, Norway.
    Best approximation in the mean by analytic functions, Conference on Bergman Spaces, invited.
1997 February The Schwarz reflection principle revisited.
    Best approximation in the mean by analytic functions, Washington University, St. Louis.
1998 January The reflection principle, Colloquium, University of Sydney, Australia, invited.
    Szegö’s theorem on extension of expansions of spherical harmonics, Colloquium, University of New South Wales, Australia, invited.
  March Approximation of Continuous functions in L1-norm, AMS Meeting, Manhattan, Kansas.
    Analytic continuation of Dirichlet Series, AMS meeting, Louisville, Kentucky.
  July Approximation in the mean by harmonic functions, Analysis Seminar, University of Michigan, invited.
  October The reflection principle, Analysis Seminar, University of Illinois, Chicago, invited.
1999 January Approximation in the mean, AMS winter meeting, San Antonio, TX.
  May Conference on PDE at Carmiel College, Israel.
    Participant in the Round Table on How to write mathematics, San Antonio, TX.
    Bounded Approximation by Analytic and Harmonic Functions, Colloquium at Technion in Haifa, Israel.
    Three lectures on Approximation in the mean by harmonic functions--Colloquiums at Technion and Bar Ilan, Israel University, and a one-hour invited talk at the Conference on PDE and Approximation Theory
  December Uniform approximation by harmonic functions, one-hour invited talk at Mittag-Leffler Institute, Sweden
2000 June Best approximation by harmonic and analytic functions, invited talk at the Joint AMS-Scandinavian Math Society meeting in Odense, Denmark.
2001 January Approximation in the mean by harmonic functions, AMS winter meeting, New Orleans.
  May Szegö’s theorem and extensions of solutions of holomorphic PDEs, Colloquium, Brown University.
  October An inverse problem for double layer potentials, Colloquium, Oklahoma State University, Washington University in St. Louis.
2002 September Three questions on harmonic functions, VOTCAM conference, University of Richmond, invited principal speaker, 2 lectures.
  October An inverse problem for double layer potentials, CIRM conference on spaces of analytic functions and operator theory, Marseilles, invited 1hour talk.
  December The isoperimetric inequality revisited, SUNY at Albany, invited colloquium talk.
2003 March Weak compactness in star invariant subspaces, SEAM, Principal Speaker, 1 hour invited talk.
  June Weak compactness in star invariant subspaces, AMS-RMSE joint meeting, Seville, invited talk
  July The isoperimetric inequality revisited, Function Theory Conference, Metz, France, invited talk.
  October Remarks on the Bohr Phenomenon, AMS meeting in Chapel Hill, NC, special session, invited.
    Zeros of Harmonic Polynomials, Colloquium, Seton Hall University, invited.
2004 February Zeros of rational harmonic functions with applications to gravitational microlensing, Functiontheorie meeting, Oberwolfach, 1 hr invited talk.
  June Extremal problems for analytic functions in Bergman spaces, two invited lectures at Bar Ilan University, Ramat Gan, Israel.
  September Zeros of rational harmonic functions and gravitational microlensing, Distinguished Visitor Lectures, Bucknell University.
  October Zeros of rational harmonic functions and gravitational microlensing, Colloquium, SUNY at Albany, invited.
  November The isoperimetric inequality revisited, Colloquium, Bucknell University, invited.
2005 January On the maximal number of zeros of certain rational harmonic functions, Special Session at the AMS Winter meeting in Atlanta, invited.
  April On the maximal number of zeros of certain rational harmonic functions, SEAM, invited.
  May Research in Pairs with Harold S. Shapiro and M. Putinar, Oberwolfach, invited.
  June The isoperimetric inequality and some free boundary problems, one hour plenary lecture at the CMFT 2005 conference, Joensuu.
  July Workshop on gravitational microlensing, AIM Palo Alto, invited.
  September Valency of certain harmonic functions and gravitational microlensing, Texas Tech University, Colloquium talk, invited.
  October Some algebraic aspects of the Dirichlet problem, Conference on recent advances in operator related function theory, a plenary talk, Madrid.
    Zeros of rational harmonic functions and microlensing, Colloquium talk, Virginia Tech.
2006 January Lightning bolts and the Dirichlet problem, Conference on Complex Analysis and Dynamical Systems, Naharia, Israel, invited talk.
    Algebraic aspects of the Dirichlet problem, Conference on Planar Harmonic mappings, Technion, Haifa, a plenary talk.
    Algebraic aspects of the Dirichlet problem, Colloquium talk, Virginia Tech, invited.
    From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, Mississippi State University, invited.
  February From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, University of South Florida, invited.
  March From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, University of California at San Diego, invited.
    From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, George Washington University, invited.
    From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, University of Tennessee, invited.
  April From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, University of Delaware, invited.
    Dirichlet problem with the rational data, AMS Meeting in Durham, NH, Special Session on Complex Analysis, invited.
  May Algebraic aspects of the Dirichlet problem, Complex and Harmonic Analysis Conference, Thessaloniki, Greece, invited talk.
  September Potential theory viewed from the complex space, Conference on Complex Analysis and Potential Theory, Istanbul, Turkey, a plenary talk.
2007 January Gravitational lensing by elliptical galaxies and the Schwarz function. Dangriga, Belize, invited talk.
    Algebraic aspects of the Dirichlet problem, R. P Gilbert 75th birthday Conference, Orlando, Florida, invited talk.
  May Gravitational lensing by elliptical galaxies and the Schwarz function, Conference on new trends in complex and harmonic analysis, Bergen, Norway, a plenary talk. (PDF)
    Nonlinear extremal problems for analytic functions, Conference on extremal problems in real and complex analysis, Moscow, Russia, invited talk. (PDF)
  July Gravitational lensing by elliptical galaxies and the Schwarz function, Quadrature domains and Laplacian growth in modern physics symposium, BIRS, Banff, invited 1 hr. talk. (PDF)
  October From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, University of Tampa, invited.
    From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, MASS Colloquium talk, Penn State, invited.(PDF)
2008 March From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Colloquium talk, Los Alamos National Laboratory, invited.
  May From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, 2 hour Colloquium talk for graduate students, University of Cyprus, invited.
    “Fingerprints” of two-dimensional shapes and lemniscates, Colloquium talk, University of Cyprus, invited.
  June Searching for singularities of solutions of the Dirichlet problem: recent developments, Workshop on Complex Analysis and Mathematical Physics, Nordfjordeid, Norway, a plenary talk.
  August From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, A Workshop on Laplacian growth and related topics, Centre de recherches mathematiques, Universite de Montreal, a plenary talk.
  December Searching for singularities of solutions of the Dirichlet problem: recent developments, A Conference on Hilbert Spaces of Analytic Functions, Centre de recherches mathematiques, Universite de Montreal, a plenary talk.
2009 January “Fingerprints” of the two-dimensional shapes and lemniscates, an invited talk at the Special Session on Function Theoretic Operator Theory, Joint Mathematics Meeting, AMS, Washington, DC, 2009.
  May From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Department of Physics, Hebrew University, Jerusalem, a colloquium talk, invited.
    “Fingerprints” of two-dimensional shapes and lemniscates, Complex analysis and Dynamical Systems IV, Naharia, Israel, an invited talk.
    Searching for singularities of solutions of the Dirichlet problem: recent developments, University of Cyprus, a colloquium talk, invited.
  June From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Los Alamos National Laboratory, Los Alamos, a colloquium talk, invited.
  September Analytic continuation in classical potential theory, Norwegian Fall School in Analysis for Ph D students and young researchers, Trondheim, Norway, a mini-course, invited.
  October From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, Duke University, a colloquium talk, invited.
    On a uniqueness property of harmonic functions, Classical Analysis in One and Several Complex Variables, Chapel Hill, an invited talk.
  December From the fundamental theorem of algebra to astrophysics; a “harmonious” path, Renyi Institute of Hungarian Academy of Sciences, a colloquium talk, invited.
    Classical Potential Theory and Holomorphic PDE, Erwin Schroedinger Institute, Vienna, an invited talk.
2010 March Malmheden's theorem revisited, UCSD at La Jolla, a colloquium talk.
  April Malmheden's theorem revisited, Albuquerque, NM, AMS Spring 2010 Meeting, Special Session on Geometric Function Theory, invited.
  May Malmheden's theorem revisited, Conference on Complex Analysis, UIUC, an invited talk.
  October From the fundamental theorem of algebra to astrophysics; a “harmonious” path, UCF, Orlando, a colloquium talk, invited.
  November “Fingerprints” of the two-dimensional shapes and lemniscates, A Workshop on Integrable and Stochastic Laplacian Growth in Modern Mathematical Physics, Banff, an invited talk.
  December “Fingerprints” of the two-dimensional shapes and lemniscates, Complex Analysis and Mathematical Physics, an international conference, Chillan, Chile, a plenary talk.
2011 February “Fingerprints” of the two-dimensional shapes and lemniscates, University of New Mexico a colloquium talk.
    From algebra to astrophysics, UNM-PNM Statewide Mathematics Contest Public Lecture, Albuquerque, an invited public lecture (canceled due to the inclement weather), (PDF).
    From algebra to astrophysics,, PiMuEpsilon Mathematics Club Lecture, University of South Florida.
  April From the fundamental theorem of algebra to astrophysics; a “harmonious” path, IUPUI, Indianapolis, a colloquium talk, invited.
    “Fingerprints” of the two-dimensional shapes and lemniscates, an invited talk at the Special Session on Complex Analysis and Banach Algebras, AMS Spring Eastern Sectional Meeting, Worcester, Massachusetts.
  May Linear extremal problems in Banach spaces of analytic functions, Complex Analysis and Dynamical Systems V, Akko, Israel, a plenary talk, invited.
  June Extremal problems for nonvanishing functions in Bergman space, Computational Complex Analysis and Approximation Theory, Protaras, Cyprus, an invited talk.
    Linear extremal problems in Banach spaces of analytic functions, Complex Analysis and Potential Theory, Centre de Recherches Mathematiques, Montreal, a 1 hr invited talk.
  September Linear extremal problems in Banach spaces of analytic functions, Workshop on Univalent Functions and Control, Mittag-Leffler Institute, Djursholm, Sweden, a 1hr invited talk.
    From the fundamental theorem of algebra to astrophysics; a “harmonious” path, University of Lund, Lund, Sweden, a colloquium talk, invited.
  December From algebra to astrophysics, a public lecture for high school seniors, Mittag-Leffler Institute, Djursholm, Sweden, invited.
    The Isoperimetric inequality and free boundary problems, Workshop on Geometric Analysis and Mathematical Physics, Mittag-Leffler Institute, Djursholm, Sweden, a 1 hr invited talk.
2012 March Holomorphic PDE in C^n, Potential Theory and Hele-Shaw Processes in R^n, a mini-course (jointly with E. Lundberg), Harmonic and Complex Analysis and Applications 2012, Tenerife, Canary Islands, Spain, invited.
  July Holomorphic PDE in C^n: J. Leray's theory of propagation of singularites, 9th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Orlando, FL, invited.
  August Extremal domains for the analytic content, Workshop on Complex Analysis and Integrable Systems, in memory of B. Korenblum, Mittag-Leffler Institute, Djursholm, Sweden, 1hr, invited.
  September Extremal domains for the analytic content, Conference on Complex and Harmonic Analysis in honor of M. Katsoprinakis, University of Crete, Heraklion, Crete, 1hr, invited.
  October From the Fundamental Theorem of Algebra to astrophysics; a “harmonious” path, a colloquium talk, University of Michigan, Ann Arbor, invited.
  December Analytic functions in Smirnov classes with real boundary values, Canadian Mathematical Society Winter Meeting, Montreal, invited.
2013 March Holomorphic PDE and Potential Theory , a one-hour tutorial, 2d International Workshop on Nonlinear and Modern Mathematical Physics, Tampa, invited.
  May An overdetermined boundary value problem, Conference on Complex Analysis and Dynamical Systems VI, Naharia, Israel, invited.
  June Algebraic aspects of the Dirichlet problem, Conference in honor of Amtony G. O'Farrell, Maynooth College, 1 hour invited talk.
    Two - dimensional shapes and lemniscates, An International Workshop on Conformal Geometry in Mapping, Imaging and Sensing, Imperial College , London, 1 hour invited talk.
  August Selected problems in classical function theory, Invariant Subspaces of the Shift Operator, Centre de Recherches Mathematiques, Montreal, Canada, 1 hr invited talk.
  September An Overdetermined boundary value problem, Norwegian Institute of Science and Technology, Trondheim, 1 hr invited talk.
  December From the fundamental theorem of algebra to astrophysics; a “harmonious” path, Optimization, Moments Problems and Geometry II, Graduate Students Winter School/Workshop, National University of Singapore, Singapore, an invited talk.
2014 January The fundamental theorem of algebra and a problem in graviational lensing. S.- H. Rhie's work, 18th Internalional Conference on Microlensing, Santa Barbara, an invited talk.
  February Some open problems for polynomials of one and several variables, Workshop on Dirichlet series and function theory in polydisks, MFO Oberwolfach, an invited talk.
  March Boundary behaviour of universal Taylor seroes, AMS Special Session on Invariant Subspaces in Function Spaces, Knoxville, an invited talk.
  April The Fundamental Theorem of Algebra, Complex Analysis and ... Astrophysics, International Conference on Complex Analysis and Related Fields, St. Petersburg, Russia, an invited plenary talk.
  May The Fundamental Theorem of Algebra, Complex Analysis and ... Astrophysics, ISM Conference, Quebec City, Canada, a keynote invited talk.
  June Some open problems for polynomials of one and several complex variables, Complex and Harmonic Analysis Workshop, Holon, Israel, an invited talk.
    “Isoperimetric sandwiches” and function theory, Annual Meeting of the Israel Math. Soc.,Special Session on Mathematics of M. Schiffer, invited .
  July Boundary behaviour of universal power series, Perspectives of Modern Complex Analysis, Banach Center, Bedlewo, Poland, an invited talk.
  October Problems for polynomials in one and several variables, Workshop on Hausdorff Geometry and Critical Points, Institute of Mathematics and Informatics, Sofia, Bulgaria, an invited talk.
    Problems for polynomials in one and several variables, Workshop on Optimal Point Configurations and Applications, Schroedinger Institute, Vienna, Austria, an invited talk.
  November “Fingerprinting”the lemniscates, Red Raider Mini-symposium: Complex Analysis, Potential Theory Special Functions and Applications, Texas Tech, Lubbock, a plenary talk.
    The isoperimetric inequality revisited, 2014 Lecture Series at the University of Tampa, an invited talk.
2015 January “Isoperimetric sandwiches” in function-theoretic operator theory, AMS Annual Winter Meeting, Special Session on Progress in Multivariate Operator Theory, San Antonio, invited.
  March From C.- F. Gauss to A. Einstein, from algebra to realativity and astrophysics via complex analysis, 2015 USF Distinguished University Professor Lecture.
  April “Between two truths of the real domain, the easiest and shortest path quite often passes through the complex domain.” P. Painleve, 1900. FAU, Boca Raton, a seminar talk.
    “Between two truths of the real domain, the easiest and shortest path quite often passes through the complex domain.” P. Painleve, 1900. FIU, Miami, a seminar talk.
    From C.- F. Gauss to A. Einstein, from algebra to relativity and astrophysics via complex analysis, FAU, Boca Raton, a colloquium talk.
  May Approximating z* by analytic functions, Complex Analysis and Dynamical Systems VII, Naharia, Israel, an invited talk.
  June Approximating z* by analytic functions, Completeness Problems, Carleson Measures and Spaces of Analytic Functions, Mittag-Leffler Institute, Djursholm, Sweden, an invited 1 hr talk.
  October The Fundamental Theorem of Algebra, Complex Analysis and ... Astrophysics, University of Bergen, a colloquium talk.
    Isoperimetric sandwiches and some free boundary problems via approximation by analytic and harmonic functions, a mini course, University of Bergen,(PDF), (PDF), (PDF), (PDF)
  November "Fingerprinting" the lemniscates, Universitat Autonoma Barcelona, a colloquium talk.
  December "Fingerprinting" the lemniscates, Stockholm University, Analysis Seminar.
    A variation on the theme of analytic continuation, Stockholm University, a colloquium talk.
2016 January “Isoperimetric sandwiches”, free boundary problems and approximation by analytic and harmonic functions, Joint Analysis Seminar, McGill, Montreal.
  February The Fundamental Theorem of Algebra, Complex Analysis and ... Astrophysics, Universite de Montreal, a colloquium talk.
  July The spectral properties of several classical function-theoretic operators and gemetry. 2016 CRM Summer School on Spectral Theory and Applications, Laval University, a 1hr invited talk.
    “Isoperimetric sandwiches”, free boundary problems and approximation by analytic and harmonic functions, A Conference on New Trends in Approximation Theory, Fields Institute, Toronto, a 1hr invited talk.
    Harmonic polynomials and rational functions: recent progress, open problems and applications, 7th ECM, Mini-Symposioum on Zeros of Harmonic Functions, Berlin, an invited talk.
  November The Fundamental Theorem of Algebra, Complex Analysis and ... Astrophysics, Brown University, an invited talk.
2017 January A note on the spectral area of Toeplitz operators, Joint AMS and MAA Winter Meeting, Special Session on Operator Theory, Function Theory and Models, Atlanta, invited.
  July Vanishing of reproducing kernels in spaces of analytic functions, Mathematics Congress of Americas, Session on Operators on Function Spaces, Montreal, invited.
  September Vanishing of reproducing kernels in spaces of analytic functions, AMS Southeastern Meeting, Session on Operators on Complex Analysis, Harmonic Analysis and Approximation Theory, Orlando, FL, invited.