Why can't I see my other processes?

[Orion Poplawski]

[root at hammer ~]# ps -fu orion
UID        PID  PPID  C STIME TTY          TIME CMD
orion     5059  5052  0 Mar08 ?        00:00:02 sshd: orion at pts/1
orion     5060  5059  0 Mar08 pts/1    00:00:01 -tcsh
orion     5238  5237  0 09:05 ?        00:00:01 -csh 
/opt/local/sge-6.0/default/spool/ham
orion     5435  5238  0 09:06 ?        00:00:00 /usr/bin/python -tt 
/usr/bin/mock --no-cl
orion     6020  5435  0 09:07 ?        00:00:00 sh -c { 
/usr/sbin/mock-helper chroot /var
orion     6038  6037  0 09:07 ?        00:00:00 rpmbuild --rebuild 
--target x86_64 --node
orion     6086  6038  0 09:07 ?        00:00:00 /bin/sh -e 
/var/tmp/rpm-tmp.69316
[...snip...]


[orion at hammer paraview-2.4.2]$ ps -fu orion
UID        PID  PPID  C STIME TTY          TIME CMD
orion     5060  5059  0 Mar08 pts/1    00:00:01 -tcsh
orion    11391  5060  0 10:02 pts/1    00:00:00 ps -fu orion

Same in top.

Super tight security?