Where there's a will, there's a way.
Read the story of Robert Frey,
http://www.ams.sunysb.edu/~frey/
who obtained nearly all of his education as a part-time student at Stony Brook (a state university located about 60 miles east of New York City, on Long Island) and is now the head of the quantitative finance program there.
http://www.ams.sunysb.edu/~frey/QuantitativeFinance/index.html
Jim Simons (founder of Renaissance Technologies, located just down the road from Stony Brook) was the chairman of the mathematics department at that university from 1968 to 1976 before venturing into finance. Jim Simons and his wife Marilyn have been especially generous with Stony Brook:
http://commcgi.cc.stonybrook.edu/am...s_Simons_And_Wife_Marilyn_A_Ph_D_Alumna.shtml
Robert Frey spent 12 years as Jim Simon's right hand at Renaissance from 1992 to 2004.
Note in particular the final page of Frey's resume, which describes his academic background:
http://www.ams.sunysb.edu/~frey/Biographical/Resume_RJFrey_20060907_11.pdf
So, I would conjecture that your best chance for pursuing such studies on a part-time basis is to establish an exemplary record in earlier (undergraduate and/or masters-level) studies at some university, and then aim to continue your doctoral studies at that same school.
As the faculty there would already know you, they may thus be more amenable to agreeing to allow such part-time studies.
Read the story of Robert Frey,
http://www.ams.sunysb.edu/~frey/
who obtained nearly all of his education as a part-time student at Stony Brook (a state university located about 60 miles east of New York City, on Long Island) and is now the head of the quantitative finance program there.
http://www.ams.sunysb.edu/~frey/QuantitativeFinance/index.html
Jim Simons (founder of Renaissance Technologies, located just down the road from Stony Brook) was the chairman of the mathematics department at that university from 1968 to 1976 before venturing into finance. Jim Simons and his wife Marilyn have been especially generous with Stony Brook:
http://commcgi.cc.stonybrook.edu/am...s_Simons_And_Wife_Marilyn_A_Ph_D_Alumna.shtml
Robert Frey spent 12 years as Jim Simon's right hand at Renaissance from 1992 to 2004.
Note in particular the final page of Frey's resume, which describes his academic background:
http://www.ams.sunysb.edu/~frey/Biographical/Resume_RJFrey_20060907_11.pdf
So, I would conjecture that your best chance for pursuing such studies on a part-time basis is to establish an exemplary record in earlier (undergraduate and/or masters-level) studies at some university, and then aim to continue your doctoral studies at that same school.
As the faculty there would already know you, they may thus be more amenable to agreeing to allow such part-time studies.