[1] Automorphisms of the lattice of recursively enumerable sets: a survey. Colloquium, Humboldt University, Berlin, Germany, 1990.
[2] Automorphisms of the lattice of recursively enumerable sets: the promptly simple sets. Midwest Model Theory Conference, Madison, WI, 1991.
[3] The interaction of structural properties of the recursively enumerable sets with the recursively enumerable degrees. Logic Colloquium, George Washington University, Washington D.C., 1991.
[4] Some thoughts on constructing automorphisms of E*. Logic Seminar, Cornell University, Ithaca, NY, 1992.
[5] The r.e. degrees and the lattice 1-3-1. Connecticut Logic Seminar, Wesleyan University, 1993.
[6] And yet another proof of ramsey's theorem. Undergraduate Mathematics Colloquium, Kalamazoo College, Kalamazoo, MI, 1993.
[7] On the cantor-bendixon rank of recursively enumerable sets. Special Session in Recursion Theory, American Mathematical Society Meeting, Washington D.C., 1993.
[8] Isomorphism, orbits and degrees. Invited Address, Annual Meeting of the Association for Symbolic Logic, Notre Dame, 1993.
[9] Lattice nonembeddings and intervals of the recursively enumerable degrees. Logic Seminar, University of Wisconsin-Madison, 1993.
[10] Incompleteness in arithmetic. Undergraduate Mathematics Colloquium, Calvin College, Grand Rapids, MI, 1994.
[11] Intervals without any critical triples. Logic Seminar, University of Wisconsin-Madison, 1994.
[12] Automorphic recursively enumerable sets. Special Session in Recursion Theory at the Logic Colloquium, Haifa, Israel, 1995.
[13] The recursively enumerable sets. Greater Boston Logic Conference, Recursion Theory Workshop, MA, 1995.
[14] Intervals without any critical triples. Logic Seminar, University of Michigan, 1995.
[15] Computably categorical structures. Logic Seminar, University of Illinois at Urbana-Champaign, 1996.
[16] Automorphisms of the computably enumerable sets. Mathematisches Forschungsinstitut Oberwolfach, Germany, 1996.
[17] Definability, automorphisms and the computably enumerable sets. Invited Address, Winter Meeting of the Association for Symbolic Logic, Orlando, FL, 1996.
[18] Permitting, forcing and copies of recursive structures. Special Session in Recursive and Feasible Mathematics, American Mathematical Society Meeting, Orlando, FL, 1996.
[19] Automorphisms of computably enumerable sets. Logic Seminar, University of Chicago, IL, 1997.
[20] More on the strength of Ramsey's Theorem for pairs. Mini-symposium in Logic at the PhD Centennial Conference, Department of Mathematics, University of Wisconsin-Madison, 1997.
[21] On Ramsey's Theorem for pairs, part II. Special Session in Computability Theory at the Logic Colloquium, Leeds, England, 1997.
[22] Automorphic computably enumerable sets. Plenary Address, Workshop on Recursion Theory and Complexity, Kazan, Russia, 1997.
[23] Automorphisms of the recursively enumerable sets. A series of 3 2-hours talks, Recursion Theory Seminar, Department of Mathematics, University of California at Berkeley, 1997.
[24] The strength of Ramsey's Theorem. Logic Colloquium, Group in Logic and Methodology of Science, University of California at Berkeley, 1997.
[25] The strength of Ramsey's theorem. Mathematics Colloquium, University of Victora, Wellington, New Zealand, 1997.
[26] The strength of Ramsey's Theorem. VIG'98 (Very Informal Gathering-Logic, UCLA, LA, CA, 1998.
[27] Automorphisms of computably enumerable sets. Logic Seminar, UC-Irvine, Irvine, CA, 1998.
[28] Some recent results on the computably enumerable sets. Logic Colloquium '99, Utrecht, Netherlands, 1999.
[29] The global structure of computably enumerable sets. AMS Summer Research Conference on Computability Theory and Applications, Boulder, CO, 1999.
[30] The strength of Ramsey's Theorem for pairs. Logic Seminar, University of Illinois at Chicago, 1999.
[31] Definable coding in the computable enumerable sets. Logic Seminar, University of Chicago, 2000.
[32] Ramsey's theorem for pairs. Mathematics Colloquium, University of Michigan, 2000.
[33] Maximal contiguous degrees. Special Session in Computability Theory at the ASL Annual Meeting, University of Illinois at Urbana-Champaign, 2000.
[34] The latest (exciting) news about the computably enumerable sets. Invited Address, Winter Meeting of the Association for Symbolic Logic, New Orleans, LA, 2001.
[35] The latest (exciting) news about the computably enumerable sets. Logic Colloquium, Indiana University-Bloomington, IN, 2001.
[36] Extension theorems and automorphisms of the computably enumerable sets. Mathematisches Forschungsinstitut Oberwolfach, Germany, 2001.
[37] On the definability of the double jump in c.e.sets. The CUNY Logic Workshop, NYC, NY, 2001.
[38] On the definability of the double jump in c.e.sets. Logic Colloquium, UCLA, LA, CA, 2001.
[39] Extensions theorems and automorphisms of the computably enumerable sets. Special Session in Computability and its applications, American Mathematical Society Meeting, San Diego, CA, 2002.
[40] Extensions theorems and automorphisms of the computably enumerable sets. Logic Colloquium, University of Wisconsin-Madison, 2002.
[41] Orbits of the computably enumerable sets. Logic Colloquium, Cornell University, 2002.
[42] A definable yet non-Δ03 orbit in the computably enumerable sets. Special Session on Computability and Models, American Mathematical Society Meeting, Baltimore, Maryland, 2003.
[43] On the complexity of orbits in E*. Computability and Logic Workshop, Heidelberg, Germany, 2003.
[44] On the complexity of orbits in E*. Special Session in Computability Theory and Effective Mathematics at the ASL Annual Meeting, University of Illinois-Chicago, 2003.
[45] The computably enumerable sets: Recent results and future directions. Invited Lecture, 12th International Congress of Logic, Methodology, and Philosophy of Science, Oviedo, Spain, 2003.
[46] The computably enumerable sets: Recent results and future directions. Keynote Address, 5th Annual Graduate Student Conference in Logic, 2004.
[47] Improving and proving the Slaman-Woodin conjecture. North Texas Logic Conference, Denton, Texas, 2004.
[48] Improving and proving the Slaman-Woodin conjecture. Special Session on Computability and Applications, AMS Sectional Meeting, Evanston, IL., 2004.
[49] Well quasi-orders; reverse mathematics and the equivalence of definitions for well and better quasi-orders. ASL-AMS Special Session on Reverse Math, AMS National Meeting, Altanta, GA., 2005.
[50] Academic publishing. Response and comments on Peter Suber's lecture What is Open Access to Science and Scholarship? at Notre Dame., 2005. Pdf.
[51] Progress on the c.e.sets: Improving and proving the Slaman-Woodin conjecture. Computational Prospects of Infinity, Institute for Mathematical Sciences, National University of Singapore, Singapore, 2005. Pdf.
[52] Uniform almost everywhere domination. Computational Prospects of Infinity, Institute for Mathematical Sciences, National University of Singapore, Singapore, 2005. Pdf.
[53] Progress on the c.e.sets: Improving and proving the Slaman-Woodin conjecture. The CUNY Logic Workshop, NYC, 2005. Pdf.
[54] Computability theory: Domination, Measure, Randomness, and Reverse Mathematics. New York Logic Colloquium, 2005. Pdf. Printable Pdf.
[55] Computability theory: Domination, Measure, Randomness, and Reverse Mathematics. Southern Wisconsin Logic Colloquium, UW-Madison, 2006. Pdf.
[56] The Computably Enumerable Sets: the Past, the Present and the Future. 2006 Greater Boston Logic Conference, 2006.
[57] The Computably Enumerable Sets: the Past, the Present and the Future. Theory and Applications of Models of Computation, 2006, Beijing China, 2006.
[58] The Computably Enumerable Sets: the Past, the Present and the Future. Nanjing University, China, 2006. Pdf.
[59] Ramsey's theorem for pairs. Nanjing University, China, 2006. Pdf.
[60] The Computably Enumerable Sets: Open Questions. Special Session on Computability Theory in Honor of Manuel Lerman's Retirement, American Mathematical Society Meeting, Storrs, CT, 2006. Pdf.
[61] Computability theory: Domination, Measure, Randomness, and Reverse Mathematics. Logic Colloquium, University of Florida, 2007. Pdf.
[62] Computability theory: Domination, Measure, Randomness, and Reverse Mathematics. Computer Science Department, University of Auckland, New Zealand, 2007. Pdf.
[63] The Computably Enumerable Sets: the Past, the Present and the Future. Computer Science Department, University of Auckland, New Zealand, 2007.
[64] The Computably Enumerable Sets: the Past, the Present and the Future. Logic Seminar, Victoria University of Wellington, Wellington, New Zealand, 2007.
[65] On Ramsey's theorem for pairs. Seminar, Research Group on Mathematical Linguistics, Universitat Rovira i Virgili, Tarragona, Spain, 2007. Pdf.
[66] Computability theory: Domination, Measure, Randomness, and Reverse Mathematics. Seminario Rubio de Francia, University of Zaragoza, Spain, 2007. Pdf.
[67] Strong jump-traceability: the computably enumerable case. Contributed Talk, Logic Colloquium 2007, Wroclaw, Poland, 2007. Pdf.
[68] Coding, orbits and computably enumerable sets. Harvard Mathematical Logic Seminar, 2007.
[69] Coding, orbits and computably enumerable sets. UCONN Logic Seminar, 2007.
[70] On liminfs. Penn State Mass Seminar, 2007.
[71] Strong jump-traceability: the computably enumerable case. Penn State Logic Seminar, 2007.
[72] On liminfs in cantor space. University of Chicago, 2008.
[73] On liminfs in cantor space. Computability, Complexity and Randomness, 08, Nanjing University, China, 2008.
[74] The computably enumerable sets. Tutorial. Asian Logic Conference 10, Kobe, Hyogo, Japan, 2008. Pdf.
[75] The computably enumerable sets, Σ11-completeness and tardy sets. Berkeley Recursion Theory Seminar, 2009.

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