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Born in Utah, Mark Wallengren and his family moved to Southern California when his mother was hired as a staff writer for NBC’s Wonderful World Of Disney. Growing up around the entertainment industry peaked his interest early on and inspired him to pursue his passion for radio. Mark is an accomplished KOST veteran where he now shares his wisdom and humor with millions of loyal listeners every afternoon.

Mark has received numerous accolades including a Star on the Hollywood Walk of Fame, Billboard Music Award - Personality of the Year, Radio & Records - Personality of the Year and two Marconi Awards – Station Of The Year. Mark has been featured in numerous radio trades, the L.A. Times, CBS This Morning, The KTLA Morning News, the movie ‘Raising Helen’ with Kate Hudson to name a few.

Mark is married and has raised four children with his wife Barbara. Outside of radio, he is an avid DIYer when it comes to home renovation projects, and as a result of his brother’s passing, is a staunch supporter of and advocate for ALS Research.






Domenic Costa was born and raised in San Pedro.  He attended Mary Star Elementary and High School.  He started his teaching and coaching career at Washington Preparatory High School in Los Angeles.  After nine years, he was asked to come coach and teach at San Pedro High School.  He was honored to coach with the legendary Mike Walsh.  During all of that time he and his wife, Pam Costa, had two phenomenal children, Lauren and Jacob.  He needed to take some time off from coaching to watch his children grow and succeed.  After 21 years at San Pedro High School, he has taught and mentored the students at Angel's Gate High School from 2013 to the present.


Also, the call to coach was strong and he was blessed to be asked by Coach Corey Miller, the newly appointed head football coach at San Pedro High School, to come back and be the head JV football coach.  He hopes to show his players the importance of being strong, responsible, and ethical young men on and off the field.

After a bout with cancer, he is creating a video legacy of football, entrepreneurship, and coaching videos on his youtube Channel, "Coach Dom Costa".  He lives his motto of "Hustle and Grind" everyday and he has to refer to his Costa Family Mission Statement: "Coaching others to greatness by example and word and therefore coaching myself to those same heights of Achievement, Fulfillment, Wonder and Peace!"

Domenic raised funds for the following charities:

Port of Los Angeles High School

San Pedro High Football

San Pedro Boys and Girls Club 

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