User details in SU01 are stored everywhere:
Read USR21 with BNAME to get PERSNUMBER (key field for other tables).
Read ADRP with PERSNUMBER for NAME_TEXT (Long Name).
Read ADR2 with PERSNUMBER for TEL_NUMBER (telephone).
Read ADR6 with PERSNUMBER for SMTP_ADDR (Emaila address).
Read USR21 with BNAME to get PERSNUMBER (key field for other tables).
Read ADRP with PERSNUMBER for NAME_TEXT (Long Name).
Read ADR2 with PERSNUMBER for TEL_NUMBER (telephone).
Read ADR6 with PERSNUMBER for SMTP_ADDR (Emaila address).