Igor Dolgachev

{{short description|Russian–American mathematician}}

{{Infobox scientist

| name = Igor Dolgachev

| image = Igor Dolgachev.jpg

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| birth_date = {{birth date and age|1944|4|7}}

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| nationality = American

| fields = Mathematics

| workplaces = Michigan (1978–)

| alma_mater = Moscow State University (Ph.D.)

| thesis_title = On the purity of the degeneration locus of families of curves

| thesis_url = https://dept.math.lsa.umich.edu/~idolga/inv69.pdf

| thesis_year = 1969

| doctoral_advisor = Igor Shafarevich

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| known_for = Dolgachev surface

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}}

Igor V. Dolgachev (born 7 April 1944{{cite book|last1=Dolgachev|first1=Igor V.|last2=Keum|first2=JongHae|last3=Kondō|first3=Shigeyuki|title=Algebraic geometry: Korea-Japan Conference in honor of Igor Dolgachev's 60th birthday, July 5-9, 2004, Korea Institute for Advanced Study, Seoul, Korea|url=https://books.google.com/books?id=1WN9ABvYDSQC&pg=PR7|access-date=20 June 2011|date=2007-01-25|publisher=American Mathematical Soc.|isbn=978-0-8218-4201-0|pages=7–}}) is a Russian–American mathematician specializing in algebraic geometry. He has been a professor at the University of Michigan since 1978. He introduced Dolgachev surfaces in 1981.{{cite book|last1=Donaldson|first1=Simon K.|author1-link=Simon Donaldson| last2=Society|first2=London Mathematical|title=Geometry of low-dimensional manifolds: proceedings of the Durham Symposium, July 1989|url=https://books.google.com/books?id=jY2oBGIzaPIC&pg=PA56|access-date=20 June 2011|year=1990|publisher=Cambridge University Press|isbn=978-0-521-39978-4|pages=56–}}

Dolgachev completed his Ph.D. at Moscow State University in 1970, with thesis On the purity of the degeneration locus of families of curves written under the supervision of Igor Shafarevich.{{MathGenealogy|7627}}