He completed a Ph.D. in information science from the University of Tokyo in 1999.
[2] Takahashi's works include several records of the number of digits of the approximation of Pi.
[3] His work on the computation of Pi has inspired his former student Emma Haruka Iwao, who broke a new record on March 14, 2019.
[4] In 2011, he was part of a team from the University of Tsukuba that won the Gordon Bell Prize of the Association for Computing Machinery for their work simulating the quantum states of a nanowire using the K computer.
[5] He is also known for his research on the Fast Fourier transform,[6][7][8] and is one of the developers of the HPC Challenge Benchmark.