Prior to that, he was on the radio with New York City's WKTU 103.5FM,[1] WHTZ 100.3FM, on Portland's KKRZ 100.3FM and KKHH "Hot 95.7 FM" in Houston.
[2] Pangilinan began his career in Houston, Texas back in 1987,[3] working for a rhythmic top 40 station KNRJ (now KHMX 96.5) under a different DJ name, Rippin' Rich.
However, his break into the radio world was when in 1993, joined KRBE 104.1 FM under Tom Poleman and Paul "Cubby" Bryant and became DJ Rich.
DJ Rich started on New York's Top 40 station Z100 every weekend with his Planet Z radio mixshow featuring the current club hits.
In August 2010, The Riddler was named Best Mixshow DJ 2011 at the Promo Only Summer Sessions/DJ Times Convention in Atlantic City.
In October 2012, Riddler released his solo EP Enigma on Soltrenz/Strictly Rhythm, which featured the vocals from DreamRoc'a, Dragonfly, Nick Fowler and Jay R. In January 2013, The Riddler was nominated for the second straight year Best Podcast at the International Dance Music Awards in Miami during the Winter Music Conference.
[2] In 2015, Pangilinan started doing productions under another alias, Sneaker Snob where he remixed such artists like Ariana Grande, Selena Gomez, OneRepublic, the 1975, and others.
In August 2018, he added Assistant Program Director/Music Director duties for Top 40 WNOW-FM "Radio Now 100.9" Indianapolis with Urban One.
[6] In January 2021, Riddler became Director of Entertainment and Digital Content for Rise Rooftop in Houston, TX, a 13,000 music venue with the largest retractable roof that is not a sports stadium.