He was born in Manila, Philippines. He immigrated to the United States at the age of six. He was raised in Palm Springs, California. He graduated from Palm Springs High School, Palm Springs, California in 1981.

In 1982 he played as the number 1 player on the Varsity Men's Tennis Team at College of the Desert, Palm Desert, California. He won the singles and doubles State of California Division II Junior College Tennis Championship. In addition, the team won the team title for the State of California.

He chose to forgo a scholarship from Southern Illinois University, Carbondale to pursue a tennis professional career. He traveled internationally competing in Japan, Hong Kong, Indonesia, Taiwan, Thailand, and the Philippines. Furthermore, he competed in Europe, traveling to Spain, France, Switzerland, and Italy. He also competed all over the East Coast from Florida to Washington DC He attained a world ranking in singles as high as 662 with wins in the top 200 players; and in doubles 457 with wins over the top 50 players.

After ending his professional tennis career, Ossil taught tennis in various tennis clubs and resorts throughout the Coachella Valley. Realizing that his future was somewhat limited without a college education, he returned to College of the Desert where he obtained an associate degree in Economics and Business Administration. While attending College of the Desert, he managed to be a Senator and eventually President of the Associated Student Body. He was asked to coach the Women's Varsity Tennis in the Spring of 1989 where the team won their division conference. The Women's team went on to reach the quarterfinals of the state championship. He was privileged to coach the MVP and number one tennis player in the conference. He was instrumental in organizing, directing, and implementing the first and only successful Mayors' Forum on the College of the Desert Campus in the Fall of 1989. This was a forum in which mayors were asked by students pertinent questions which affected the citizens in the Coachella Valley. This was a very successful event! (Side Note: Mayor Sony Bono of Palm Springs was in attendance at this forum, which was instrumental to the launch of his political career.)

Ossil transferred from College of the Desert to University of Redlands and finally completed his bachelors in business at California State University, San Bernardino. In August of 1995 he completed his master's degree in business with the concentration in organizational management at the University of Phoenix. He completed a Doctor of Education in Instructional Technology and Distance Education from Nova Southeastern University in 2002. He intends to utilize all that he has learned from life, academics, and experiences to better the outcome of those he serves.