- Read UNIX V6 source code in 1980.
- First paid UNIX related work with UNOS in 1982.
- Designed/implemented first Shell history LRU editor in 1982.
- Worked on first Sun-Microsystems computer in Europe in February 1985
- Designed/implemented first SCSI generic driver in August 1986.
- Designed/implemented first "file emulates blockdevice" driver in 1988.
- Designed/implemented first Copy-On-Write filesystem 1988-1991.
- Wrote cdrecord in late 1995.